Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1d951b147f640d5…

MALICIOUS

PDF

54.7 KB Created: 2020-07-10 11:19:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2b150e1547f8b09935e03e2f83df7a86 SHA-1: 8ff413b19ed1a1faa5587166027d67c2a661fe4d SHA-256: d1d951b147f640d54035c098ac8d48293d7f4d8fe1713c430014340313612690
154 Risk Score

Malware Insights

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

The PDF contains a link farm designed to redirect users to malicious infrastructure, as indicated by the 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_LINK_FARM' heuristics. The primary malicious URL identified is https://ttraff.ru/wb?keyword=occupational%20safety%20and%20health%20management%20system%20pdf. The document body also contains numerous links to external PDF files, likely part of a SEO poisoning or link farm strategy to distribute malware.

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.ru/wb?keyword=occupational%20safety%20and%20health%20management%20system%20pdf
    • http://files.ajsalsa.com/uploads/1/3/0/7/130776176/4728117.pdf
    • http://files.gullcottagecrafts.net/uploads/1/3/0/9/130969209/3158819.pdf
    • http://files.wyomingbeaglebeauties.com/uploads/1/3/2/8/132814415/figawu-kuxetu.pdf
    • http://files.malamathesea.com/uploads/1/3/1/1/131164047/40521.pdf
    • http://files.cmspso.com/uploads/1/3/0/8/130813516/joguteragevase.pdf
    • http://files.threeravenspianostudio.com/uploads/1/3/1/4/131407565/sawopuvo-wemewimi.pdf
    • http://files.theflourishsisterhood.com/uploads/1/3/1/3/131398156/95d18288fa830.pdf
    • http://files.zanyunoodles.com/uploads/1/3/0/7/130739381/sikete-wemotuta.pdf
    • https://vurunuguma.files.wordpress.com/2020/07/donivusorufuku.pdf
    • https://xeveralim.files.wordpress.com/2020/06/16909490254.pdf
    • https://zowolov.files.wordpress.com/2020/06/24510370024.pdf
    • https://depizawadi33663686.files.wordpress.com/2020/06/35782134773.pdf
    • https://wofezezu.files.wordpress.com/2020/07/76433253347.pdf
    • https://mewiwetezat.files.wordpress.com/2020/06/49826334527.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/62222626122.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/8007882555.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/sovonuvebapade.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/luvibuxunefipefijuli.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/93527538138.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xuvekalododit.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000934b.bin
df9693bf2d9d6e9c33f0796898b779c0aef6c741f623a232056df73395ed122d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x934B 5484 bytes
font_01_sfnt_off0000a5d6.bin
ec56172fd929f24e8028563ff5caa800ed11ebde250ff2890d18ff2556a918df		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA5D6 12280 bytes

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