Malicious PDF — malware analysis report

Static analysis result for SHA-256 026d0a2ca045cc0b…

MALICIOUS

PDF

50.9 KB Created: 2020-08-21 14:43:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 65721b6625fee1d16b6ea603d0a045f5 SHA-1: 096033a9d20b258bec1c6b927422805bf4f17473 SHA-256: 026d0a2ca045cc0bdd57eefad1c3d5267b548ecadc646609321ab9b0cd076568
154 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to malicious infrastructure, specifically a URL designed to lure users with a medical keyword. The ML classifier strongly indicates maliciousness, and the presence of numerous external links suggests a link farm or SEO poisoning tactic to distribute malicious content. No scripts were extracted, but the primary attack vector appears to be social engineering via a deceptive document.

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=acidosis+metabolica+en+recien+nacidos+pdf
    • http://files.cantornote.com/uploads/1/3/2/8/132814977/vobuwadefi.pdf
    • http://tedevibaj.houseofkshop.com/uploads/1/3/1/3/131380160/fukob-lanivawiz-ruzapoma-duweluguv.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/7275/6648/files/52759659527.pdf
    • https://cdn.shopify.com/s/files/1/0433/7532/9441/files/foxowubikakosozarebova.pdf
    • https://cdn.shopify.com/s/files/1/0429/3420/6631/files/78506136143.pdf
    • https://cdn.shopify.com/s/files/1/0434/3191/9765/files/19074331558.pdf
    • https://cdn.shopify.com/s/files/1/0430/0891/7657/files/nazunelagu.pdf
    • https://cdn.shopify.com/s/files/1/0437/8660/0597/files/14713512801.pdf
    • https://cdn.shopify.com/s/files/1/0433/7188/8803/files/mirabexobugakep.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/86593634255.pdf
    • https://cdn.shopify.com/s/files/1/0443/8881/0918/files/digi_key_paypal.pdf
    • https://cdn.shopify.com/s/files/1/0440/2518/4421/files/deguxa.pdf
    • https://cdn.shopify.com/s/files/1/0431/2986/4343/files/prentice_hall_chemistry_textbook_answers.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_off00007f35.bin
252d9280528b058b9b54abdc77b97c3d45d821517ea5374c0bc9f25dfb0c9fbe
pdf-font-stream PDF embedded font (sfnt) at offset 0x7F35 5432 bytes
font_01_sfnt_off00009184.bin
676d7e1f15c3b49b68f1a4b7858131f8b5996bee5417ec5685853ae119824104
pdf-font-stream PDF embedded font (sfnt) at offset 0x9184 13916 bytes