Malicious PDF — malware analysis report

Static analysis result for SHA-256 83bfc2943e66d300…

MALICIOUS

PDF

59.0 KB Created: 2020-08-18 23:58:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b8415922337abc83093c9a626c752408 SHA-1: 35523e5f0b6c854568de49d85dfb2cdc3966ce13 SHA-256: 83bfc2943e66d30043f5a2bfefbb0a30ce47d17e8a60f056319177c4ca588f2b
194 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which are algorithmically generated and point to external PDF files, suggesting a link farm or SEO poisoning tactic. One critical link redirects to a known malicious infrastructure at 'https://ttraff.com/pify?keyword=battle+royale+manga+pdf', likely serving as a gateway to a malicious payload. The ML classifier also strongly indicated maliciousness.

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.com/pify?keyword=battle+royale+manga+pdf
    • http://tipom.hamiltonpotterytools.co.nz/uploads/1/3/0/8/130873851/6958390.pdf
    • http://matezen.northamericancatholicecumenicalchurch.org/uploads/1/3/0/8/130814515/1288409.pdf
    • http://fasik.topnotch-designs.com/uploads/1/3/0/7/130739695/ff3c9b2991.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/8648/6440/files/fejale.pdf
    • https://cdn.shopify.com/s/files/1/0433/0595/9574/files/18490159408.pdf
    • https://cdn.shopify.com/s/files/1/0430/6341/0845/files/30276023595.pdf
    • https://cdn.shopify.com/s/files/1/0447/9270/9271/files/wiwupubodubiwibazik.pdf
    • https://cdn.shopify.com/s/files/1/0431/1007/2481/files/growth_hacker_marketing.pdf
    • https://cdn.shopify.com/s/files/1/0434/0157/6615/files/48315858107.pdf
    • https://cdn.shopify.com/s/files/1/0435/8792/8223/files/pawozutexikabudekijola.pdf
    • https://cdn.shopify.com/s/files/1/0435/2330/9727/files/billy_joel_just_the_way_you_are_piano.pdf
    • https://cdn.shopify.com/s/files/1/0432/8344/7968/files/libro_sagrado_del_budismo.pdf
    • https://cdn.shopify.com/s/files/1/0433/9315/5230/files/kokikufubaf.pdf
    • https://cdn.shopify.com/s/files/1/0434/2510/4028/files/spherical_plain_bearing_catalogue.pdf
    • https://cdn.shopify.com/s/files/1/0433/9938/1146/files/as_cronicas_de_spiderwick_2.pdf
    • https://cdn.shopify.com/s/files/1/0440/3098/4357/files/80952507094.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000865b.bin
dfa3e2117a32f9356a8e55226e4974fa00c04cf84a3f7c42a0181017da989a2d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x865B 10116 bytes
font_01_sfnt_off0000a755.bin
62b844c7d7926078533fa9ebeb99f97052bd1d7b8105cc486adabd4c3ef18043		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA755 5332 bytes
font_02_sfnt_off0000b968.bin
11163f7903198224894faecfda4ad6cb43d01cbe406fbd17042e35ea4b085780		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB968 10736 bytes

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