Malicious PDF — malware analysis report

Static analysis result for SHA-256 08677a0fd2d0cc71…

MALICIOUS

PDF

53.8 KB Created: 2020-07-30 00:55:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8486896590dc4840bdac3f3a64193f00 SHA-1: 5801c066ae5d82d57a1c44c2a00810252e87b0b7 SHA-256: 08677a0fd2d0cc71f79844ad6a4094c1a09d03da4c869cdad3ad630cc24a2d41
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one identified as a known malicious redirector. The ML classifier also strongly indicated maliciousness. While no scripts were extracted, the sheer volume of links suggests an attempt to lure users to malicious sites, potentially for phishing or malware distribution.

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.ru/pify?keyword=biodata+format+pdf+simple
    • http://files.steependurance.com/uploads/1/3/2/6/132683000/pudidipumenu-ketolekigote-puxuwirupimulur-nekajabapa.pdf
    • http://files.mandarinspeakingplayground.com/uploads/1/3/1/8/131856877/vetidawidadupimob.pdf
    • http://files.sennpen.com/uploads/1/3/1/6/131637889/rajuvivunisobi_mupilazuzexare_xijobarujup.pdf
    • http://files.joel2missions.org/uploads/1/3/1/4/131453657/18fbb037e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0439/8632/1566/files/14003495641.pdf
    • https://cdn.shopify.com/s/files/1/0433/2745/5382/files/58200722146.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/69892687871.pdf
    • https://cdn.shopify.com/s/files/1/0436/9347/3947/files/92663125818.pdf
    • https://cdn.shopify.com/s/files/1/0430/3618/0634/files/80491927165.pdf
    • https://cdn.shopify.com/s/files/1/0430/7766/4929/files/75633211826.pdf
    • https://cdn.shopify.com/s/files/1/0429/7159/4911/files/79747339291.pdf
    • https://cdn.shopify.com/s/files/1/0430/6993/1671/files/parifomagibewabal.pdf
    • https://cdn.shopify.com/s/files/1/0430/9454/0452/files/29846549509.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/47475247643.pdf
    • https://cdn.shopify.com/s/files/1/0433/6176/3480/files/75298710359.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_off00009623.bin
26d6cf855ba5c1c2521efd838d2cac562b9a2b9f9d197039716b7ca11264d10c
pdf-font-stream PDF embedded font (sfnt) at offset 0x9623 4916 bytes
font_01_sfnt_off0000a6dc.bin
329d46a82062277bff50ec201713a44dced341360e6a7a61ced55160cbae2b99
pdf-font-stream PDF embedded font (sfnt) at offset 0xA6DC 10420 bytes