Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b2a3c16fafb8181…

MALICIOUS

PDF

42.4 KB Created: 2020-07-09 14:48:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-04
MD5: 17b9a66860d097ec7cb0037f55e11661 SHA-1: d36a931bd8ad568b71fa51b93f1fd3c1111c4a13 SHA-256: 7b2a3c16fafb81813e8e1ab905e94367ef134160e9e95a88104193bafbcbc8a5
224 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document functions as a link farm, directing users to numerous external PDF files hosted on disposable domains. The primary lure appears to be a fake resume download, indicated by the document body and the initial redirector URL. The extensive use of link farms and disposable hosting suggests an attempt to distribute malware or phishing content, likely through a chain of redirects and downloads.

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.cc/wb?keyword=resume%20format%20download%20pdf In PDF document text
    • http://files.ticsndt.com/uploads/1/3/1/8/131856176/rerosot.pdfIn PDF document text
    • http://files.cninc.org/uploads/1/3/2/7/132740479/5324237.pdfIn PDF document text
    • http://files.plussizeweddingdressesinmassachusetts.com/uploads/1/3/0/8/130814007/2853417.pdfIn PDF document text
    • http://files.odditieseclub.com/uploads/1/3/2/6/132695881/rapis.pdfIn PDF document text
    • http://files.andreapulido.com/uploads/1/3/1/4/131452989/8957b0437.pdfIn PDF document text
    • http://files.adhesivetreats.shop/uploads/1/3/2/6/132696263/e18b86e.pdfIn PDF document text
    • http://files.baltimorespa.net/uploads/1/3/0/7/130775940/9806876.pdfIn PDF document text
    • http://files.freshrescue.com/uploads/1/3/1/3/131398357/2325814.pdfIn PDF document text
    • http://files.patriciagodden.com/uploads/1/3/1/4/131483019/5adf2.pdfIn PDF document text
    • http://files.riverbendins.com/uploads/1/3/1/8/131856071/nenixebamiv-voxijelazulupo-xikalibugezim-rakuletoligixiw.pdfIn PDF document text
    • http://files.maggieshine.com/uploads/1/3/1/4/131452778/8b212eb4.pdfIn PDF document text
    • http://files.openstarmaths.org/uploads/1/3/1/6/131637919/98fc8f5e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://puneruxa.files.wordpress.com/2020/07/jajugoxapisurosavu.pdfIn PDF document text
    • https://lorelezinilu.files.wordpress.com/2020/06/25872522271.pdfIn PDF document text
    • https://polulexugiz.files.wordpress.com/2020/06/19974248951.pdfIn PDF document text
    • https://zelojusonim.files.wordpress.com/2020/06/davoxoj.pdfIn PDF document text
    • https://gedudupirig.files.wordpress.com/2020/07/469618680.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tovetutokukike.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/91960476686.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/bijuwosozawubuvenokuzi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/99237037604.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_off000069eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x69EB 5120 bytes
SHA-256: 42457bcdc70d3cb44487d0f0b4de576bac7c6ff5f7167c08e5d7d786aaa46b94
font_01_sfnt_off00007b4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7B4B 9700 bytes
SHA-256: 61b856ef5ab9d3db165693a0f791427cb11df3fdabb2c5e4e541fdbac042c17a