Malicious PDF — malware analysis report

Static analysis result for SHA-256 0785f9dd9fbc2067…

MALICIOUS

PDF

40.8 KB Created: 2020-08-26 14:12:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 020ca407f778c76e580cd45279ebc08d SHA-1: c399d1a624bbdbb6d59325d1ad80bd9a9e900129 SHA-256: 0785f9dd9fbc2067e8f224413491f7efb544b2722128bfdaca53cba8db81a6ad
154 Risk Score

Malware Insights

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

The PDF contains a link farm and a redirector URL, indicating an attempt to lead users to malicious content. The document body, though partially corrupted, suggests a lure related to computer hardware. The presence of embedded URLs and the ML classifier's high confidence score support the malicious verdict. No scripts were extracted, but the PDF structure itself is used for 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.cc/pify?keyword=hardware+interno+y+externo+del+computador
    • http://files.pemachenacu.com/uploads/1/3/1/1/131164124/6294218.pdf
    • http://minuxupir.corehealthbemidji.com/uploads/1/3/1/4/131438563/mobejejud_kidideno.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/3863/8241/files/gomat.pdf
    • https://cdn.shopify.com/s/files/1/0437/4098/7543/files/taxinuzunokas.pdf
    • https://cdn.shopify.com/s/files/1/0431/8471/7979/files/71975011765.pdf
    • https://cdn.shopify.com/s/files/1/0436/6296/6937/files/93652802663.pdf
    • https://cdn.shopify.com/s/files/1/0430/1013/0073/files/58061919617.pdf
    • https://cdn.shopify.com/s/files/1/0430/7084/9181/files/nolejimepepesofepepufuzi.pdf
    • https://cdn.shopify.com/s/files/1/0428/3603/3695/files/serem.pdf
    • https://cdn.shopify.com/s/files/1/0433/3459/8809/files/muxakoginolexosipid.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/89647405972.pdf
    • https://cdn.shopify.com/s/files/1/0438/3680/1181/files/35996883110.pdf
    • https://cdn.shopify.com/s/files/1/0435/8547/0623/files/2004_vw_beetle_owners_manual.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_off00005ec0.bin
8ef1969fae137a83553cb7afa8343021bd2554e4be50d85047f8f6fc2db8ca44
pdf-font-stream PDF embedded font (sfnt) at offset 0x5EC0 5264 bytes
font_01_sfnt_off000070a8.bin
026052228c098091d138caf99c80cefdef5fa8fdd25e660019ff5aab675e823e
pdf-font-stream PDF embedded font (sfnt) at offset 0x70A8 10840 bytes