Malicious PDF — malware analysis report

Static analysis result for SHA-256 77157ca1995617f5…

MALICIOUS

PDF

35.0 KB Created: 2020-08-23 17:01:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 185f276db47de1e4f6ad48c7f02387d6 SHA-1: 7ad24a05e429249caff306098496fcf20e69a40a SHA-256: 77157ca1995617f5e138479040428ed355109e19f09e020cc2ed299e5cea72fc
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link disguised as a data sheet that redirects to a known malicious URL. The document also features a large number of external PDF links, many hosted on Shopify, suggesting a link farm or SEO poisoning tactic. The ML classifier strongly flagged this PDF as malicious. The primary malicious IOC is the redirector URL.

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=vg+32+hydraulic+oil+data+sheet
    • http://files.heavitreesquilometre.org/uploads/1/3/0/7/130738553/9532524.pdf
    • http://fawojogu.gunnessfinancial.com/uploads/1/3/2/6/132696280/13607d588ea4e.pdf
    • https://cdn.shopify.com/s/files/1/0432/4176/7072/files/dosebezobeperezixekevu.pdf
    • https://cdn.shopify.com/s/files/1/0432/6221/4304/files/7436020449.pdf
    • https://cdn.shopify.com/s/files/1/0433/1021/9432/files/54175296326.pdf
    • https://cdn.shopify.com/s/files/1/0433/7421/5331/files/takesopib.pdf
    • https://cdn.shopify.com/s/files/1/0428/9419/6902/files/zapepilifisuvumafi.pdf
    • https://cdn.shopify.com/s/files/1/0434/8110/4541/files/77489422393.pdf
    • https://cdn.shopify.com/s/files/1/0435/2029/5064/files/45345114178.pdf
    • https://cdn.shopify.com/s/files/1/0428/7902/5318/files/asian_countries_currency_and_capital.pdf
    • https://cdn.shopify.com/s/files/1/0431/7750/9020/files/31146808658.pdf
    • https://cdn.shopify.com/s/files/1/0431/3314/1146/files/43214680685.pdf
    • https://cdn.shopify.com/s/files/1/0432/2210/6271/files/kufosezaka.pdf
    • https://cdn.shopify.com/s/files/1/0430/9699/8041/files/65726345078.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000049b7.bin
be6fdc0f99f58b14110851b95a93e7adf7a52616d64ced098d4fcc713b8c3f0a
pdf-font-stream PDF embedded font (sfnt) at offset 0x49B7 5564 bytes
font_01_sfnt_off00005c95.bin
65fb00202def7255a1b3c03659e859a3c362b0f78af2c6fd0f60d934f535eb0e
pdf-font-stream PDF embedded font (sfnt) at offset 0x5C95 10092 bytes