Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d422870fea1596b…

MALICIOUS

PDF

50.3 KB Created: 2020-07-09 04:48:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-15
MD5: d2b23d80c9b62d1cd218fdf3f37ebf56 SHA-1: c2a24379b0102cfbe657eed6e1f063a9c83e6eed SHA-256: 1d422870fea1596bd82d3b3691dd6fbd8b0d91e12f5281aba3a3a6cfed75b807
224 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of embedded links, with one pointing to a known malicious redirector. The document body and embedded links suggest a link farm or SEO poisoning tactic to lure users to malicious sites. The ML classifier strongly supports the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.ru/wb?keyword=bloody%20bones%20pdf In PDF document text
    • http://files.madlyeclectic.com/uploads/1/3/1/4/131483253/nuwitoduku_xafozovininu_lekilirox_navagad.pdfIn PDF document text
    • http://files.sidleystandup.com/uploads/1/3/0/7/130775942/3089407.pdfIn PDF document text
    • http://files.sittingsisters.com/uploads/1/3/1/3/131384771/senobuvugujapulebume.pdfIn PDF document text
    • http://files.computerscpr.com/uploads/1/3/2/7/132740860/xubujolodosetejokuv.pdfIn PDF document text
    • http://files.fitzpatrickecologicalconsulting.com/uploads/1/3/1/6/131607269/dadivufesale.pdfIn PDF document text
    • http://files.portville-presbyterian.org/uploads/1/3/1/3/131398367/lebebi.pdfIn PDF document text
    • http://files.dianehaymesphotography.com/uploads/1/3/1/8/131858287/94fcd.pdfIn PDF document text
    • http://files.autumnskinner.com/uploads/1/3/1/3/131380032/4414022.pdfIn PDF document text
    • http://files.nalinikrishnankutty.com/uploads/1/3/0/8/130874128/mewajuluxojuvafox.pdfIn PDF document text
    • http://files.theroute92.com/uploads/1/3/0/8/130873973/zuguxizamuri.pdfIn PDF document text
    • http://files.hartosteopathy.com/uploads/1/3/2/8/132814969/bimas.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://metefodowu.files.wordpress.com/2020/06/tewazisuwumofute.pdfIn PDF document text
    • https://kuborenop.files.wordpress.com/2020/07/98135656120.pdfIn PDF document text
    • https://vosariboju268504950.files.wordpress.com/2020/06/bowupa.pdfIn PDF document text
    • https://pigejonuzona.files.wordpress.com/2020/07/wikuzazugufibaxejatot.pdfIn PDF document text
    • https://wogikasu.files.wordpress.com/2020/06/zizov.pdfIn PDF document text
    • https://bawegepagema.files.wordpress.com/2020/06/zezesojuz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/12410546401.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/lewajoranuputefikilos.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/58097506778.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/gidawibozifuniji.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/31052941417.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000087f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x87F5 4680 bytes
SHA-256: a9dac7ca60ee52dfb2b735ba7da8e76349e4f8a0d7a69b982b1321a1b587aec4
font_01_sfnt_off000097ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x97EA 10656 bytes
SHA-256: 944dee1c9e42f83b87c6db9447d31932326fbfbad37097674e0e65550bace179