Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c6fc335e5266493…

MALICIOUS

PDF

45.6 KB Created: 2020-08-22 08:22:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: df5815b1cb35c1f7f0815f63f26e8e36 SHA-1: f3ea6fbad1cbf25156a84a29d042ef9bbae7ef35 SHA-256: 6c6fc335e52664937d4aeef051cf6699d4b45a86c5e8e9231c7b65ca55edd470
154 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for linking to known malicious redirector infrastructure, specifically pointing to `https://ttraff.com/pify?keyword=community+college+hero+acrobat+guide`. It also exhibits characteristics of a link farm, embedding numerous external PDF links, some of which are hosted on Shopify. The ML classifier strongly flagged this PDF as malicious. While no scripts were extracted, the embedded URLs and the nature of the heuristics suggest 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=community+college+hero+acrobat+guide
    • http://files.ittawamba235.com/uploads/1/3/1/4/131452991/kewekasa-nuzusexufep-bofemalozakesa.pdf
    • http://pobixiv.boiseimagehealthservices.com/uploads/1/3/2/6/132682035/maraxul-sigonukosa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/5639/0551/files/kinisob.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/32732230761.pdf
    • https://cdn.shopify.com/s/files/1/0430/8588/9689/files/32232616486.pdf
    • https://cdn.shopify.com/s/files/1/0435/5689/6920/files/68992768648.pdf
    • https://cdn.shopify.com/s/files/1/0429/1503/7343/files/traducir_archivo_de_aleman_a_espaol.pdf
    • https://cdn.shopify.com/s/files/1/0429/0609/1687/files/ottoman_empire_history.pdf
    • https://cdn.shopify.com/s/files/1/0428/6365/7119/files/zodemumiferozubuzevo.pdf
    • https://cdn.shopify.com/s/files/1/0429/6274/7545/files/rofilaxupunif.pdf
    • https://cdn.shopify.com/s/files/1/0431/8865/0142/files/27741516093.pdf
    • https://cdn.shopify.com/s/files/1/0434/5744/6050/files/ranupafizesabulosemowa.pdf
    • https://cdn.shopify.com/s/files/1/0431/1557/7504/files/tixax.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_off000073db.bin
be18c9b034f9543c3970911000bf7fea4179e3dbcedf44631629356ef5011df0
pdf-font-stream PDF embedded font (sfnt) at offset 0x73DB 5320 bytes
font_01_sfnt_off000085c7.bin
d77966a1adc7c220f4968a8c89e71ce7d5d9e26c01f379bb78b59ee3dc0d25ae
pdf-font-stream PDF embedded font (sfnt) at offset 0x85C7 10544 bytes