Malicious PDF — malware analysis report

Static analysis result for SHA-256 75dff2588b9abbd1…

MALICIOUS

PDF

48.7 KB Created: 2020-08-18 16:52:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4882ef821393a8879e3bab776c17168d SHA-1: bd2ec4e9287e24286d23f508cc331927bad1d0de SHA-256: 75dff2588b9abbd176f9738c5d010dbd7d6b03350349c6fd26ef5af2d0aff59a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to Shopify domains, but one critical link directs to a known malicious redirector. This suggests a link farm or SEO poisoning tactic designed to drive traffic to malicious infrastructure. The ML classifier also strongly indicated maliciousness.

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=24+helping+verbs+list+pdf
    • http://files.andrewmartinsmith.com/uploads/1/3/1/4/131409074/xawusosuren-giviro-susan.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/3387/7915/files/bajaj_pulsar_150_bs4_spare_parts_catalogue.pdf
    • https://cdn.shopify.com/s/files/1/0433/0595/9588/files/batman_beyond_remastered.pdf
    • https://cdn.shopify.com/s/files/1/0432/0264/2075/files/34408942535.pdf
    • https://cdn.shopify.com/s/files/1/0434/0108/5082/files/87370660321.pdf
    • https://cdn.shopify.com/s/files/1/0433/2778/3080/files/2717051456.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/31056735454.pdf
    • https://cdn.shopify.com/s/files/1/0432/3429/5966/files/bit_mesra_b_tech_application_form_2019.pdf
    • https://cdn.shopify.com/s/files/1/0431/9834/9471/files/32334510724.pdf
    • https://cdn.shopify.com/s/files/1/0436/8770/6777/files/organic_chemistry_notes_a_level.pdf
    • https://cdn.shopify.com/s/files/1/0434/4610/8312/files/simple_monthly_budget_worksheet_for_young_adults.pdf
    • https://cdn.shopify.com/s/files/1/0432/8026/9462/files/mezutamamobamizomona.pdf
    • https://cdn.shopify.com/s/files/1/0443/0499/0364/files/autosar_layered_software_architecture.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_off00007ed3.bin
863bdd37040112aeced0a8d87bd3f4166a2ba4a5f990a0d030c0d667ffd2c402
pdf-font-stream PDF embedded font (sfnt) at offset 0x7ED3 5416 bytes
font_01_sfnt_off0000913b.bin
a230da4e7983f6fac8581c25b243b7e5c1617a049321a58fa33b7f8def329bed
pdf-font-stream PDF embedded font (sfnt) at offset 0x913B 11052 bytes