Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d6bf899956ee481…

MALICIOUS

PDF

50.5 KB Created: 2020-07-29 21:31:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 531d3660e85610110d3e32bbec1ce5c6 SHA-1: e642975d200c36c3e839c6df462dbdbb52791af1 SHA-256: 0d6bf899956ee4812df4ff887b928388d2dbd98fc349cad6238c3ce18c7b6ec3
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many pointing to Shopify domains hosting other PDFs, suggesting a link farm or SEO manipulation tactic. One critical heuristic identified a link to a known malicious redirector, ttraff.com, which is likely the primary malicious destination. The document body text is heavily obfuscated and unreadable, but the presence of the 'define antibiotics pdf' string in the URL suggests a lure.

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=define+antibiotics+pdf
    • http://files.freewheelingwriter.com/uploads/1/3/2/6/132695372/6239418.pdf
    • http://files.midmodcollective.com/uploads/1/3/0/8/130813841/bc994b949ddb1d.pdf
    • http://files.utcpanhellenic.com/uploads/1/3/0/7/130774993/nosasifusafi.pdf
    • http://files.fichautauqua.com/uploads/1/3/0/7/130775776/484f03f23a.pdf
    • http://files.moraviabaptistchurch.org/uploads/1/3/1/3/131398360/35bc98.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/7877/0076/files/nepoxivigenur.pdf
    • https://cdn.shopify.com/s/files/1/0429/8027/8426/files/bodul.pdf
    • https://cdn.shopify.com/s/files/1/0432/8167/8494/files/modizenobeligefajibegezeg.pdf
    • https://cdn.shopify.com/s/files/1/0430/0672/2211/files/77525064496.pdf
    • https://cdn.shopify.com/s/files/1/0431/8530/7808/files/30231473306.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/72890356131.pdf
    • https://cdn.shopify.com/s/files/1/0438/4423/9510/files/xosuvotepibilagofesal.pdf
    • https://cdn.shopify.com/s/files/1/0428/9911/2095/files/43882426324.pdf
    • https://cdn.shopify.com/s/files/1/0432/9324/5590/files/nojek.pdf
    • https://cdn.shopify.com/s/files/1/0430/3680/3233/files/sasiguwezimifapa.pdf
    • https://cdn.shopify.com/s/files/1/0432/5621/7750/files/87202701417.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_off00008497.bin
fe0b1a60c6935ea42cc8311919392c9d5669252951a3896b043c65c6a1310e74
pdf-font-stream PDF embedded font (sfnt) at offset 0x8497 4948 bytes
font_01_sfnt_off00009577.bin
500c1c1a60c7c5f081251ff52efe2e45d6a328c16e3f5aa299f13724eb40d22f
pdf-font-stream PDF embedded font (sfnt) at offset 0x9577 11400 bytes