Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f829d7bdcbd218b…

MALICIOUS

PDF

33.8 KB Created: 2020-08-09 00:03:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e28cebde5fa63ade6533707f44142711 SHA-1: a040c6b15a2ac023b2fd383d0fbeae43dbff1566 SHA-256: 5f829d7bdcbd218b086dbd23bd75b3a4e9e652103af63112ff3126eb8f789f2f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with one identified as a malicious redirector. The heuristic PDF_SEO_LINK_FARM indicates a large number of external PDF links, suggesting a link farm or spamming operation. The ML classifier also strongly flagged this PDF as malicious. The embedded URLs are likely used to lure victims to malicious sites.

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=bendito+dios+lldm+pdf
    • http://xerenede.amesburyschoolcoalition.com/uploads/1/3/1/4/131407164/8858498.pdf
    • http://wapomep.geophysics-cph.org/uploads/1/3/1/3/131398560/a8aa08b.pdf
    • http://moxojaxa.mitradingschool.com/uploads/1/3/1/4/131407995/kokegiza-koguke.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/8984/5671/files/79990084495.pdf
    • https://cdn.shopify.com/s/files/1/0433/6045/2760/files/93913843395.pdf
    • https://cdn.shopify.com/s/files/1/0433/8561/8583/files/jidisojak.pdf
    • https://cdn.shopify.com/s/files/1/0434/2228/5976/files/hot_dip_metal_coating.pdf
    • https://cdn.shopify.com/s/files/1/0434/1104/6558/files/71814165139.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/92399027362.pdf
    • https://cdn.shopify.com/s/files/1/0431/1970/6273/files/9761745709.pdf
    • https://cdn.shopify.com/s/files/1/0434/8579/0365/files/33393153187.pdf
    • https://cdn.shopify.com/s/files/1/0431/3477/9553/files/19452813859.pdf
    • https://cdn.shopify.com/s/files/1/0428/6945/7063/files/introduction_to_networks_lab_manual_cisco.pdf
    • https://cdn.shopify.com/s/files/1/0435/4434/6792/files/55622701971.pdf
    • https://cdn.shopify.com/s/files/1/0428/6863/7862/files/analytical_hierarchy_process_journal.pdf
    • https://cdn.shopify.com/s/files/1/0436/9865/1288/files/faritisesidi.pdf
    • https://cdn.shopify.com/s/files/1/0436/4405/9806/files/7113463321.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_off00004a09.bin
439da195e1157b8d80bce87065e00b8d92acd58104651a5bff93862c4edafbc8
pdf-font-stream PDF embedded font (sfnt) at offset 0x4A09 4932 bytes
font_01_sfnt_off00005ac3.bin
21e7f629398aa72f8d8e351b69193238b4789a943574afbb007ffaf42740040c
pdf-font-stream PDF embedded font (sfnt) at offset 0x5AC3 9336 bytes