Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ac40442a4e74dc0…

MALICIOUS

PDF

44.2 KB Created: 2020-08-11 01:17:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 50c300437d352456f3523dc7eb4987d2 SHA-1: 1311cea19e3ec9d7c775ededb92e556d7aa30b9d SHA-256: 6ac40442a4e74dc020e22c2db0a968faa88e499b96ac9f0bb431057cf22f4789
154 Risk Score

Malware Insights

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

The PDF contains embedded links that lead to a redirector service, which is a common tactic for distributing malware or phishing content. The document body and heuristics indicate a lure for a PDF download, ultimately directing users to the malicious URL. No scripts were extracted, but the presence of embedded URLs and the ML classifier's high confidence suggest malicious intent.

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=abirami+anthathi+in+tamil+pdf+download
    • http://files.damianshishkin.com/uploads/1/3/0/7/130740213/rezumebuweza.pdf
    • http://tovaw.gofiguremath.com/uploads/1/3/2/7/132740285/dazivepemejupanam.pdf
    • http://bofolari.lindaandrei.com/uploads/1/3/0/7/130739197/sebawusad.pdf
    • http://files.beechinorchiropractic.com/uploads/1/3/2/7/132710624/jusejigi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/7266/8319/files/behringer_x32_rack_user_manual.pdf
    • https://cdn.shopify.com/s/files/1/0431/3081/4626/files/online_catechism_of_the_catholic_church.pdf
    • https://cdn.shopify.com/s/files/1/0430/0279/0039/files/mofalalosefumiguwa.pdf
    • https://cdn.shopify.com/s/files/1/0431/3320/6690/files/12657941624.pdf
    • https://cdn.shopify.com/s/files/1/0427/4978/8327/files/39122124114.pdf
    • https://cdn.shopify.com/s/files/1/0434/9073/8328/files/1857_to_1947_history_of_pakistan_in_english.pdf
    • https://cdn.shopify.com/s/files/1/0430/7258/5888/files/63012747358.pdf
    • https://cdn.shopify.com/s/files/1/0434/7245/3797/files/22137501444.pdf
    • https://cdn.shopify.com/s/files/1/0432/0044/6626/files/91383895688.pdf
    • https://cdn.shopify.com/s/files/1/0433/8765/0211/files/jidemunage.pdf
    • https://cdn.shopify.com/s/files/1/0439/3785/7691/files/catenary_equation_derivation.pdf
    • https://cdn.shopify.com/s/files/1/0432/3786/7687/files/greater_soul_gem.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_off0000623d.bin
85bf62ce97f467028040fc93fb9c1744bfad1ee04b481b2593c3c9b9a3254a31		 pdf-font-stream PDF embedded font (sfnt) at offset 0x623D 5324 bytes
font_01_sfnt_off00007432.bin
e10fc09ca2f293145f4386fe01291dcd04ab71cf1c7ca70cc67b3cc9c81a71d1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7432 14724 bytes

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