Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8f94552c13a4413…

MALICIOUS

PDF

34.6 KB Created: 2020-07-09 12:16:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-24
MD5: 06ac201e37988827e9a86c397e79ea0f SHA-1: 5bc34eaeaa8fe400cb3a035ac65ad3b813ee78ee SHA-256: a8f94552c13a4413155609a4bf0bc1124e12a3c837eaacfdff4499e76450f878
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF document contains a large number of embedded links, many of which point to redirector infrastructure. The primary lure appears to be a fake 'Telugu bible pdf file download' which redirects to the malicious URL https://ttraff.ru/pify. This suggests a link-farming or redirection-based attack designed to lead users to malicious content. The presence of numerous external PDF links also indicates a potential SEO poisoning or link farm strategy.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) or Microsoft license-boilerplate documents that carry no urgency or charge/dispute escalation.
  • 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.ru/pify?keyword=telugu+bible+pdf+file+download In PDF document text
    • http://files.heracleous.org/uploads/1/3/1/3/131398093/5858615.pdfIn PDF document text
    • http://files.m25initiative.org/uploads/1/3/1/3/131398432/fijupotapilewoxomas.pdfIn PDF document text
    • http://files.iucnbsg.org/uploads/1/3/1/4/131438024/686dfb92f68596.pdfIn PDF document text
    • http://files.vegetablekids.net/uploads/1/3/1/1/131164567/mozadufowut_besel.pdfIn PDF document text
    • http://files.vanessanysten.com/uploads/1/3/0/7/130739769/958ec35a8.pdfIn PDF document text
    • http://files.macpacdanes.com/uploads/1/3/2/6/132680955/xodukejomerot.pdfIn PDF document text
    • http://files.beaverdamchurchonline.com/uploads/1/3/1/4/131408241/sobuwelexapinifo.pdfIn PDF document text
    • http://files.suncoastsoul.com/uploads/1/3/1/3/131379612/baretanemomimu.pdfIn PDF document text
    • http://files.biophysical-ecology.com/uploads/1/3/1/4/131406356/xivut_girusidusowele_finusagon.pdfIn PDF document text
    • http://files.giveitaway.net/uploads/1/3/2/3/132303020/4972202.pdfIn PDF document text
    • http://files.lkoc.org/uploads/1/3/1/3/131383497/bofepowoj.pdfIn PDF document text
    • http://files.whistlingfrogresort.com/uploads/1/3/2/6/132681002/masaberilanimubaloji.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://nojurofezep809160310.files.wordpress.com/2020/07/6522549690.pdfIn PDF document text
    • https://denines.files.wordpress.com/2020/07/8713386560.pdfIn PDF document text
    • https://xezerak.files.wordpress.com/2020/06/vonefasumujebipufalelaja.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/89573664631.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/54440827626.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/66083684812.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004c68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4C68 4920 bytes
SHA-256: 4023b0283e8b42f3d9075c6a891b719e13c43d0c568d71f98ba7f50a39cb82d8
font_01_sfnt_off00005d3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5D3B 9596 bytes
SHA-256: 6dd20889adc71bf8e014fc868a1c0cfe2edc7295d1a16a462ff8187f31d29933