Malicious PDF — malware analysis report

Static analysis result for SHA-256 014f449ad899be7b…

MALICIOUS

PDF

38.7 KB Created: 2020-08-25 11:07:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a33155e27b9b44dc0efab80195d237c2 SHA-1: 03c47bc5e49cacb4ed7b49af750b00bf7212183c SHA-256: 014f449ad899be7b4143941b0d6c83824b33e5b4c409a2fa2997a7514d0dbe7b
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a critical heuristic firing indicating a link to known malicious redirector infrastructure. The document body, though partially corrupted, includes the URL 'https://ttraff.com/pify?keyword=inference+worksheet+grade+4', suggesting a lure related to educational content. The presence of a large number of external PDF links, many hosted on Shopify, points towards a link farm strategy to obscure the ultimate destination.

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=inference+worksheet+grade+4
    • http://files.seergreensingers.com/uploads/1/3/1/3/131382092/bedugopabuxemesow.pdf
    • http://files.jordangirardin.com/uploads/1/3/1/4/131409264/c40211.pdf
    • http://xemabubox.fragilebutunbroken.com/uploads/1/3/1/1/131164066/0ac49f06c4a75b3.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/8607/8369/files/vujuzurinelutaje.pdf
    • https://cdn.shopify.com/s/files/1/0438/1822/1730/files/botrytis_cinerea_the_cause_of_grey_mould_disease.pdf
    • https://cdn.shopify.com/s/files/1/0431/9058/3458/files/aws_access_key.pdf
    • https://cdn.shopify.com/s/files/1/0428/9619/5737/files/jaxelim.pdf
    • https://cdn.shopify.com/s/files/1/0432/5195/7923/files/26435335501.pdf
    • https://cdn.shopify.com/s/files/1/0432/9373/7110/files/fugadolalazaxojunigomomaj.pdf
    • https://cdn.shopify.com/s/files/1/0438/8945/9368/files/bt_smart_hub_manual.pdf
    • https://cdn.shopify.com/s/files/1/0434/7750/0057/files/78900866824.pdf
    • https://cdn.shopify.com/s/files/1/0428/1679/8883/files/watuxarilav.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/budazasinopuxa.pdf
    • https://cdn.shopify.com/s/files/1/0438/1884/4322/files/rsmssb_ldc_answer_key_paper_i_and_ii.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_off00005938.bin
79f0b172ac4b128ceab4a917bbc6bbee4fbfe8a53c923eb07ecd4450f10e6589
pdf-font-stream PDF embedded font (sfnt) at offset 0x5938 5432 bytes
font_01_sfnt_off00006bbf.bin
39235410b7022e83c50c6eaf5c9569dc671376a90957f40a5b21395537389624
pdf-font-stream PDF embedded font (sfnt) at offset 0x6BBF 10204 bytes