Malicious PDF — malware analysis report

Static analysis result for SHA-256 07c2a804dc50f7cd…

MALICIOUS

PDF

44.5 KB Created: 2020-08-31 09:48:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 536cee37e2d9e6d16c4132bba4fc22d8 SHA-1: 395e48699bcd121621e5454c7ebbf3498e554039 SHA-256: 07c2a804dc50f7cda06c97d65e906ceddb35a9f1c3d0f68aae4bfabb4377c207
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with one pointing to a known malicious redirector. The ML classifier strongly indicated maliciousness, and the presence of a link farm suggests an attempt to manipulate search engine results or distribute further malicious content. While no scripts were extracted, the heuristic firings and embedded URLs point to a malicious document designed for distribution or redirection.

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/wix?keyword=chainfire+terry+goodkind
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/6822/6725/files/26340152767.pdf
    • https://cdn.shopify.com/s/files/1/0434/5207/2086/files/blavatsky_collected_writings.pdf
    • https://cdn.shopify.com/s/files/1/0430/8297/3346/files/girozorijatog.pdf
    • https://cdn.shopify.com/s/files/1/0428/4622/4551/files/28859705231.pdf
    • https://cdn.shopify.com/s/files/1/0438/0560/6049/files/experience_certificate_of_civil_engineer.pdf
    • https://cdn.shopify.com/s/files/1/0437/1021/8391/files/tamil_hindu_news_paper.pdf
    • https://cdn.shopify.com/s/files/1/0434/0930/9848/files/cuisinart_little_pro_plus.pdf
    • https://cdn.shopify.com/s/files/1/0428/6588/5351/files/57259489159.pdf
    • https://cdn.shopify.com/s/files/1/0435/4618/1787/files/81366483939.pdf
    • https://cdn.shopify.com/s/files/1/0429/8761/8463/files/asia_tenggara_dalam_kurun_niaga_jilid_2.pdf
    • https://cdn.shopify.com/s/files/1/0428/8679/1334/files/liwenel.pdf
    • https://static.usrfiles.com/ugd/cf79db_bb1cd2b6cdb34c0cb01ceb1bd7f5a90b.pdf
    • https://static.usrfiles.com/ugd/086daf_393af6a13cf54333a51f1abf2e1e8232.pdf
    • https://static.usrfiles.com/ugd/23b571_e7d89b3e9faa4506a6f3ae0b3aa0f410.pdf
    • https://static.usrfiles.com/ugd/24853a_9cd5499029424c119bf00145134b983b.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_off000070d7.bin
e9bc8b5e495c53a6eef7260e3449b30817e240058e0c3aec0c31302107a6e92d
pdf-font-stream PDF embedded font (sfnt) at offset 0x70D7 5028 bytes
font_01_sfnt_off000081f1.bin
873ae0e6af8caa48bbc1e370053ae2377a2f64592abe1e9177dd85fa8d9146d0
pdf-font-stream PDF embedded font (sfnt) at offset 0x81F1 10384 bytes