Malicious PDF — malware analysis report

Static analysis result for SHA-256 6aad5d9af4421bc3…

MALICIOUS

PDF

44.3 KB Created: 2020-08-19 01:51:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d80200ccb3df5caf895b72e6b29cea4e SHA-1: 684f26fbda35476e0215a62ccd978893392c9656 SHA-256: 6aad5d9af4421bc39da7458587a4afc5e469033d3cf4bdda0514af2ad0d85423
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDF files hosted on Shopify. One prominent link, disguised as a download for "whatsapp messenger for mac os x", redirects to malicious infrastructure at ttraff.com. This suggests a link farm or SEO poisoning attack designed to drive traffic to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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.com/pify?keyword=whatsapp+messenger+for+mac+os+x
    • http://wunonuv.newsunyoga.co.uk/uploads/1/3/1/4/131454143/demulaz-pevowil-femeta-kuzokitubabo.pdf
    • http://files.peggymdavis.com/uploads/1/3/0/9/130969160/bivubuvex.pdf
    • http://gines.fightordieclothing.com/uploads/1/3/2/6/132696198/nidiwupixatiwir.pdf
    • http://files.empressreadings.com/uploads/1/3/0/8/130813654/8470633.pdf
    • http://files.theshabbynest.com/uploads/1/3/1/0/131070178/4ae4e5a6d55856.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/1278/4277/files/58337847834.pdf
    • https://cdn.shopify.com/s/files/1/0432/9173/8277/files/30723912193.pdf
    • https://cdn.shopify.com/s/files/1/0437/9544/7970/files/pimorovawepeginudevedeni.pdf
    • https://cdn.shopify.com/s/files/1/0433/6769/4487/files/cds_2019_form_apply.pdf
    • https://cdn.shopify.com/s/files/1/0434/0911/3253/files/recent_advances_in_plant_biotechnology.pdf
    • https://cdn.shopify.com/s/files/1/0431/9353/2573/files/42359245753.pdf
    • https://cdn.shopify.com/s/files/1/0431/8717/5588/files/dell_vostro_3580_datasheet.pdf
    • https://cdn.shopify.com/s/files/1/0430/4191/5042/files/fallout_4_perk_guide_sniper.pdf
    • https://cdn.shopify.com/s/files/1/0430/3205/1873/files/16326140783.pdf
    • https://cdn.shopify.com/s/files/1/0433/0120/8232/files/mobukelofuwezakonaxo.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000066f9.bin
e2e12769165246f59c641a237bfbaefe10c21a87e59ed7a52bf11d8208fd9aed
pdf-font-stream PDF embedded font (sfnt) at offset 0x66F9 5480 bytes
font_01_sfnt_off00007989.bin
aa8117be82e65b395bbd2aa30ab6222740aec6d7f36fdb20909710773814f0a5
pdf-font-stream PDF embedded font (sfnt) at offset 0x7989 13348 bytes