Malicious PDF — malware analysis report

Static analysis result for SHA-256 70af689d12e4e103…

MALICIOUS

PDF

42.4 KB Created: 2020-08-09 15:37:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: db9af26c8c52432334b39e658fe721ab SHA-1: 59cbcf11e041d6c8e8fb51cd3cf39a794e5f247e SHA-256: 70af689d12e4e103b7d0f40623b1ccdf2e436ed7f2754e47666ff7252bb79bf3
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains multiple embedded links, with one specifically pointing to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though obfuscated, contains the same URL as the redirector, suggesting an attempt to lure users to malicious infrastructure for further exploitation.

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=candidiasis+oral+pdf+pediatria
    • http://files.essentialmensclinic.com/uploads/1/3/1/4/131483020/majakizoropelakiwa.pdf
    • http://zusog.bttau.com/uploads/1/3/1/3/131379246/7338202.pdf
    • http://files.jesswebbart.com/uploads/1/3/2/8/132814241/zawebutorowog_mojefem_badojijidarim_fatitobematepaj.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/6048/5541/files/83284837211.pdf
    • https://cdn.shopify.com/s/files/1/0433/0546/8068/files/44346841858.pdf
    • https://cdn.shopify.com/s/files/1/0433/7840/9622/files/sukopew.pdf
    • https://cdn.shopify.com/s/files/1/0430/5590/6967/files/css_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0439/9045/0334/files/applications_of_centrifugal_casting.pdf
    • https://cdn.shopify.com/s/files/1/0436/0437/7763/files/91177056721.pdf
    • https://cdn.shopify.com/s/files/1/0428/6968/6431/files/alzheimer_traitement_naturel.pdf
    • https://cdn.shopify.com/s/files/1/0449/5455/0440/files/carboplatin_smpc.pdf
    • https://cdn.shopify.com/s/files/1/0430/9457/3205/files/kenmore_elite_oasis_dryer.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/50833930904.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_off00006839.bin
bfb48b5b2ad2b45375f69084aeef794d9be347930251ede5a90ebc65f68c9289
pdf-font-stream PDF embedded font (sfnt) at offset 0x6839 4940 bytes
font_01_sfnt_off0000790f.bin
7f37828a2263ba658eef09328bb23a27c990ba2c3a119bb59301607ec6cf3a0a
pdf-font-stream PDF embedded font (sfnt) at offset 0x790F 10576 bytes