Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a9934508432b8ce…

MALICIOUS

PDF

56.2 KB Created: 2020-08-17 15:38:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b68d6f0ecf92158fdd853fc257b1d3b5 SHA-1: 7faa703ce3cdb9239ea0c082075031c28a4e6b81 SHA-256: 0a9934508432b8ce659bf9d8b5ec324c9ab5d4a1301b4fa844ccbeacf901912c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, with a critical heuristic firing indicating it points to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains a URL that appears to be the primary lure. 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=html5+educational+website+templates+free
    • http://files.byrdhouseandladybugs.com/uploads/1/3/0/7/130740342/notasemiwovevo.pdf
    • http://nurawa.rosesoma.com/uploads/1/3/2/3/132302815/6327413.pdf
    • http://files.markdalebaptist.org/uploads/1/3/1/8/131856987/silakemixobaw.pdf
    • http://sijin.mpelite.org/uploads/1/3/2/6/132681237/6879988.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/4447/0933/files/25036034296.pdf
    • https://cdn.shopify.com/s/files/1/0432/2256/5032/files/cannabinoid_chart.pdf
    • https://cdn.shopify.com/s/files/1/0428/8312/1319/files/how_to_read_psychrometric_chart.pdf
    • https://cdn.shopify.com/s/files/1/0433/9027/1638/files/wukes.pdf
    • https://cdn.shopify.com/s/files/1/0433/9492/4694/files/70786893575.pdf
    • https://cdn.shopify.com/s/files/1/0438/4679/5424/files/register_sublime_text.pdf
    • https://cdn.shopify.com/s/files/1/0429/4760/8730/files/zakixagejasokamizejuves.pdf
    • https://cdn.shopify.com/s/files/1/0432/5621/7750/files/87202701417.pdf
    • https://cdn.shopify.com/s/files/1/0444/4202/6150/files/pssc_physics_textbook.pdf
    • https://cdn.shopify.com/s/files/1/0431/6508/9949/files/nyc_parent_affidavit_of_residency_form.pdf
    • https://cdn.shopify.com/s/files/1/0429/6137/1290/files/56016456947.pdf
    • https://cdn.shopify.com/s/files/1/0432/7417/4624/files/english_brushup_5th_edition_free.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_off00009d10.bin
9ad7a578de98f4a204a4e5ff1a2e2221d11bb9568174ff8f6ce5bd7d82e1ef8c
pdf-font-stream PDF embedded font (sfnt) at offset 0x9D10 5620 bytes
font_01_sfnt_off0000b01a.bin
da5c4cd46007b9f93227e648009d2bde686f1b8c8f1aa3212f09e0a3fca12efc
pdf-font-stream PDF embedded font (sfnt) at offset 0xB01A 10308 bytes