Malicious PDF — malware analysis report

Static analysis result for SHA-256 776419faffaa35d1…

MALICIOUS

PDF

43.3 KB Created: 2020-07-30 09:26:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e552504ebfa4d8713e89face7eb22c3c SHA-1: de28bfa704c3b9896546f8b9ebc36200a9244baa SHA-256: 776419faffaa35d1ea54f0c24be5526f5c41004c2a61f5692633192b2e769802
154 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous external PDF links, including one pointing to known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. While no scripts were directly extracted, the presence of embedded URLs and the link farm suggest an attempt to redirect users to malicious sites, likely for phishing or malware distribution.

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.cc/pify?keyword=artificial+intelligence+course+material.+pdf
    • http://files.swegas.com/uploads/1/3/1/3/131380583/gipegomaxuriberawun.pdf
    • http://files.jcneedles.com/uploads/1/3/1/4/131452903/boteverejeben-jekejuxi-bivodu-bakedumapej.pdf
    • http://files.sawmlian.com/uploads/1/3/1/6/131607712/vutejepasaratoz_nikan.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/32878299647.pdf
    • https://cdn.shopify.com/s/files/1/0433/5632/3995/files/xopukuxotutoserurilafevo.pdf
    • https://cdn.shopify.com/s/files/1/0437/3354/9205/files/85065553815.pdf
    • https://cdn.shopify.com/s/files/1/0428/6971/9196/files/gofene.pdf
    • https://cdn.shopify.com/s/files/1/0432/8197/3416/files/1492477467.pdf
    • https://cdn.shopify.com/s/files/1/0433/4636/2533/files/12164387122.pdf
    • https://cdn.shopify.com/s/files/1/0427/4274/3207/files/nixulonetivililiveti.pdf
    • https://cdn.shopify.com/s/files/1/0427/9877/6487/files/bipozipazenanaxomagumow.pdf
    • https://cdn.shopify.com/s/files/1/0433/4996/6998/files/zajeguwuzen.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/65545430121.pdf
    • https://cdn.shopify.com/s/files/1/0427/6636/8935/files/vozapuremifuluserexew.pdf
    • https://cdn.shopify.com/s/files/1/0438/2218/6656/files/savekujaligawides.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_off00006a72.bin
9b139a5aa0310af95ed41e0eaca0c23cc64cc7e1b318e2e337d63d9bf86571f4
pdf-font-stream PDF embedded font (sfnt) at offset 0x6A72 5380 bytes
font_01_sfnt_off00007c9d.bin
9119c7d26326c84c654cd7036e8711350c2b4efe14d78259dcfece9fc21e2f37
pdf-font-stream PDF embedded font (sfnt) at offset 0x7C9D 10384 bytes