Malicious PDF — malware analysis report

Static analysis result for SHA-256 870ac225fb012b6d…

MALICIOUS

PDF

40.6 KB Created: 2020-08-19 02:08:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7ab21d2f8ee33bc102bc8d8b01779d06 SHA-1: ea239ff60c0b3853b9ad8839eaf17f9647fb279a SHA-256: 870ac225fb012b6d2593a48e2b8beffd2566e19cb5311de642c794c864c41040
154 Risk Score

Malware Insights

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

The PDF contains embedded URLs, with one specifically identified as a malicious redirector. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and the ML classifier strongly indicate malicious intent. The document body, though partially corrupted, contains text suggesting it's a prospectus, which is likely a lure to encourage clicks on the malicious link.

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=bullers+wood+sixth+form+prospectus
    • http://files.indochineonline.com/uploads/1/3/1/4/131453255/dapiniwidazuvad.pdf
    • http://tafiv.ncef-ca.org/uploads/1/3/1/1/131164250/falotusuwokoze-fadamukagaw.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/1822/2753/files/general_biochemistry_mcqs.pdf
    • https://cdn.shopify.com/s/files/1/0431/5889/6802/files/sonic_scene_creator_5.pdf
    • https://cdn.shopify.com/s/files/1/0437/5661/7877/files/raxurabedip.pdf
    • https://cdn.shopify.com/s/files/1/0429/7064/4631/files/99141933122.pdf
    • https://cdn.shopify.com/s/files/1/0429/2821/0073/files/92337221804.pdf
    • https://cdn.shopify.com/s/files/1/0436/0686/8126/files/payroll_voucher_entry_in_tally_erp_9.pdf
    • https://cdn.shopify.com/s/files/1/0434/1566/6849/files/degapirofepodaji.pdf
    • https://cdn.shopify.com/s/files/1/0434/9421/1750/files/33815416183.pdf
    • https://cdn.shopify.com/s/files/1/0432/6037/9286/files/85463009874.pdf
    • https://cdn.shopify.com/s/files/1/0427/8992/9116/files/16217718649.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_off00005f5a.bin
e45979d15be60f933eeaccf84deb591f50a8ad4ed47bf675fc81d5c23615ce83
pdf-font-stream PDF embedded font (sfnt) at offset 0x5F5A 5392 bytes
font_01_sfnt_off000071ab.bin
b542c80114263abaf9b72fe1f1b8b72cc25793ef21e5694273422bb0d44a641c
pdf-font-stream PDF embedded font (sfnt) at offset 0x71AB 10656 bytes