Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a97bb92cd18e474…

MALICIOUS

PDF

45.0 KB Created: 2020-08-21 10:03:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 34e0145914156a454e9d49d89d0f290d SHA-1: a76b2eeecbe33cadffa010a57aa3b4d6770262af SHA-256: 3a97bb92cd18e474831207ed7bac6fe449e9efb5c31790cf19dd9954d0fba10e
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to benign Shopify URLs, but one critical link directs to a known malicious redirector. The document body, though heavily obfuscated, contains text related to 'gift certificate template nz' and the malicious URL, suggesting a lure. The ML classifier also strongly flagged this PDF as malicious. The primary attack vector appears to be a malicious link embedded within the document, designed to redirect users to harmful infrastructure.

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=gift+certificate+template+nz
    • http://kuzena.ashtangayogaphoenix.com/uploads/1/3/1/8/131857304/surupuvoduxigawavov.pdf
    • http://files.frameglaze.net/uploads/1/3/1/3/131379554/wudekebakaruliv.pdf
    • https://cdn.shopify.com/s/files/1/0432/7401/0782/files/anorexia_nerviosa_y_bulimia_amenazas_a_la_autonoma.pdf
    • https://cdn.shopify.com/s/files/1/0452/2138/0247/files/tiwarowe.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/46506788711.pdf
    • https://cdn.shopify.com/s/files/1/0439/0502/4168/files/edmodo_free_for_windows_7.pdf
    • https://cdn.shopify.com/s/files/1/0446/0986/3843/files/finanzas_bursatiles_ayala.pdf
    • https://cdn.shopify.com/s/files/1/0440/3950/4022/files/jitutiteguvojajovu.pdf
    • https://cdn.shopify.com/s/files/1/0434/7258/4861/files/t_c_s_company_information.pdf
    • https://cdn.shopify.com/s/files/1/0428/6011/8175/files/dogefadatalajilulurix.pdf
    • https://cdn.shopify.com/s/files/1/0434/1471/6572/files/newquay_cribbar_surf_report.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zetelonum.pdf
    • https://cdn.shopify.com/s/files/1/0433/0048/7332/files/krishna_bhajan_karna_hai.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/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006632.bin
3b2059c61b73929669d8e61712a64739e096f0104b86084008b2480d6d3a87ad		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6632 4740 bytes
font_01_sfnt_off0000762f.bin
a2474dcc1386b1c756def3dd4f83185bdce182fea9154c69cc5313f119d45285		 pdf-font-stream PDF embedded font (sfnt) at offset 0x762F 10320 bytes
font_02_sfnt_off00009946.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9946 4324 bytes

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