Malicious PDF — malware analysis report

Static analysis result for SHA-256 71275df173059786…

MALICIOUS

PDF

44.5 KB Created: 2020-09-30 07:05:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: bd3283a7ac4cbff0faa419258b590bac SHA-1: ded6a61e6e32ba3e604d8800354ea7333897c406 SHA-256: 71275df173059786ef2e1ebef140f6fdc671e70cc39273b6b305d9fd2596437d
224 Risk Score

Malware Insights

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

This PDF document contains numerous links to external PDF files hosted on a variety of disposable domains, a common tactic for SEO poisoning or distributing malicious content. One of the primary links redirects through a known malicious infrastructure, suggesting a deliberate attempt to lead users to harmful sites. The ML classifier also strongly indicated maliciousness.

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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • 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://gettraff.ru/pify?keyword=smart+math+problems In PDF document text
    • http://files.tiafinnauthor.com/uploads/1/3/1/4/131438439/2b07d.pdfIn PDF document text
    • http://xoxaru.lakechristianministries.org/uploads/1/3/1/4/131453540/9623529.pdfIn PDF document text
    • http://files.jagregina.com/uploads/1/3/1/8/131871535/lurusut.pdfIn PDF document text
    • http://files.jennyshepherdphotography.com/uploads/1/3/0/8/130814682/e6f3c54.pdfIn PDF document text
    • http://fawitomap.ianlong.org/uploads/1/3/2/6/132681670/morusuvo.pdfIn PDF document text
    • http://vasiwoguz.learningforlittlepeoplepreschool.com/uploads/1/3/1/8/131857090/95962d4e.pdfIn PDF document text
    • http://gigajeda.engramikhalil.com/uploads/1/3/1/4/131407089/kenax.pdfIn PDF document text
    • http://files.whs-vocal-music.org/uploads/1/3/0/7/130775398/9377931.pdfIn PDF document text
    • http://luluz.azacarryout.com/uploads/1/3/2/7/132740399/fonuraja.pdfIn PDF document text
    • https://site-1037245.mozfiles.com/files/1037245/dofum.pdfIn PDF document text
    • https://site-1036783.mozfiles.com/files/1036783/xurizobozisapesavex.pdfIn PDF document text
    • https://site-1037098.mozfiles.com/files/1037098/robazasupevowizugekaza.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/7923/6760/files/the_certified_reliability_engineer_handbook_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/6775/3116/files/36923630493.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/1080/9256/files/57505595236.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/4678/0566/files/husqvarna_7021r_parts_manual.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_off0000712b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x712B 5304 bytes
SHA-256: 4c8cfafdb9e8beed87aa59fd4b4daaa258083dbade4b409c7ccec33f62b3d340
font_01_sfnt_off000082f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x82F8 10068 bytes
SHA-256: c66479508e6d7d6c6c7408d1afc0021777c1a5fcc4d3162155e89969ba76ac35

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