Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b23e1eaa91915c7…

MALICIOUS

PDF

57.6 KB Created: 2020-08-05 12:01:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e230260990209fbb4235b4e46ac86964 SHA-1: 0eca487bf638d7e94e030f524e76ad536becc7d2 SHA-256: 6b23e1eaa91915c7081d663724a3d8203717343e33fd795aec1fea16e24323c8
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.com, disguised as a 'pharmacy syllabus'. The document also exhibits characteristics of a link farm, with numerous external PDF links, many hosted on Shopify. The ML classifier strongly indicates maliciousness, and the embedded URL is a primary indicator of a phishing or malware distribution attempt.

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=b+pharmacy+syllabus+pdf+2020
    • http://files.marlawhitephotography.com/uploads/1/3/0/9/130969678/0644eecb5e71a.pdf
    • http://xuluse.whldesign.com/uploads/1/3/1/4/131483337/mivisusitawusibuz.pdf
    • http://files.collieinspections.com/uploads/1/3/1/4/131483336/19042d.pdf
    • http://files.zuntzmusic.com/uploads/1/3/1/8/131857465/gidutasivaxazex.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/7623/0046/files/2001_yamaha_v_star_650.pdf
    • https://cdn.shopify.com/s/files/1/0437/7437/8142/files/ps2_emulators_for_android.pdf
    • https://cdn.shopify.com/s/files/1/0434/7396/1110/files/pudilejokabuparelopomage.pdf
    • https://cdn.shopify.com/s/files/1/0431/0381/3781/files/forobujabilejil.pdf
    • https://cdn.shopify.com/s/files/1/0431/4162/8053/files/4450828041.pdf
    • https://cdn.shopify.com/s/files/1/0432/3259/2040/files/voxivudakadafojegowu.pdf
    • https://cdn.shopify.com/s/files/1/0430/8706/9348/files/tuvivafelerefis.pdf
    • https://cdn.shopify.com/s/files/1/0434/7199/5033/files/50294063924.pdf
    • https://cdn.shopify.com/s/files/1/0430/1042/4993/files/85523839613.pdf
    • https://cdn.shopify.com/s/files/1/0444/1836/7654/files/tomb_of_annihilation_book.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_off0000977d.bin
628ea4bda7b786f02ae9ca40b5f8f412749e306b64ba472e0d3289bd12dceb62
pdf-font-stream PDF embedded font (sfnt) at offset 0x977D 5960 bytes
font_01_sfnt_off0000ab9f.bin
2e59a3b2035cf5a73d565b4b887578cb2719b691bb824dd50f31e902d536de3c
pdf-font-stream PDF embedded font (sfnt) at offset 0xAB9F 14788 bytes