Malicious PDF — malware analysis report

Static analysis result for SHA-256 0091557065b7a9f3…

MALICIOUS

PDF

44.8 KB Created: 2020-08-07 18:39:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 650ae6d6f7b9ca07286024cc45b57580 SHA-1: ec9d3982af291e6e88b4f58775dd33f6ca9b3ecc SHA-256: 0091557065b7a9f305dcde2d2b4c8f949fef38f58c0f39204211e60246c3b3fe
194 Risk Score

Malware Insights

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

The PDF contains numerous links to external PDFs, many of which are algorithmically generated and hosted on suspicious domains, indicating a link farm for SEO poisoning. The primary redirector link `https://ttraff.ru/pify?keyword=telecharger+encyclopedia+universalis+pdf` suggests a lure to download malicious content disguised as legitimate files. The ML classifier strongly supports the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • 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=telecharger+encyclopedia+universalis+pdf
    • http://files.sentrinalipa.com/uploads/1/3/0/9/130969089/f0d75ab25c.pdf
    • http://tijefazip.andytheargumentativearchaeologist.com/uploads/1/3/1/4/131483281/d6ec0c7fc5392.pdf
    • http://kiler.darrenellisdance.com/uploads/1/3/2/3/132303382/1947373.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/8117/9037/files/mafidupobolanuxoda.pdf
    • https://cdn.shopify.com/s/files/1/0437/8984/4637/files/wunobopamimakisowura.pdf
    • https://cdn.shopify.com/s/files/1/0428/5235/2159/files/52913666473.pdf
    • https://cdn.shopify.com/s/files/1/0433/4292/1886/files/45867906764.pdf
    • https://cdn.shopify.com/s/files/1/0437/7211/7141/files/boxoxolazusuxe.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zukax.pdf
    • https://cdn.shopify.com/s/files/1/0427/8134/3900/files/fotizexo.pdf
    • https://cdn.shopify.com/s/files/1/0428/0070/9791/files/minecraft_world_seed_map.pdf
    • https://cdn.shopify.com/s/files/1/0437/6795/5610/files/19627456784.pdf
    • https://cdn.shopify.com/s/files/1/0433/4449/4750/files/tolotapuwixekix.pdf
    • https://cdn.shopify.com/s/files/1/0432/7243/7910/files/74113696440.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_off00006f9c.bin
ec364472c455ebef34325cab681ca422ee83a7f0b84a3df90c01fdcf45e59ccf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F9C 5528 bytes
font_01_sfnt_off00008271.bin
49c508a20934365a83f32568e61bdcb8e0ada276124401291740cc661027716a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8271 10592 bytes

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