Malicious PDF — malware analysis report

Static analysis result for SHA-256 04034dc250869107…

MALICIOUS

PDF

39.7 KB Created: 2020-08-24 10:41:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2da8c933654bc24decb8c92f0aa69d17 SHA-1: 9a7215cce4d1f66fb11adb0443c54cc3c954494a SHA-256: 04034dc2508691074f4e6f62735fdfc757b075e9c76352dfa62f0dd92fff7de4
194 Risk Score

Malware Insights

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

This PDF document contains numerous external links, many of which point to link farms and redirectors, indicating a phishing or scam attempt. The document body, though heavily obfuscated, contains the URL 'https://ttraff.cc/pify?keyword=conditional+probability+pdf+worksheet', which is flagged as a malicious redirector. The presence of a large number of external PDF links, including algorithmically generated ones, suggests an attempt to manipulate search engine results or distribute malicious content.

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.cc/pify?keyword=conditional+probability+pdf+worksheet
    • http://files.azure-heros.com/uploads/1/3/0/8/130814390/6f7e564e86c.pdf
    • http://woxarawok.greaterstlouisschoollibrarians.org/uploads/1/3/0/7/130776208/gafoxujosod-pebixiz-rododosor.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0427/4647/8759/files/27085064708.pdf
    • https://cdn.shopify.com/s/files/1/0427/9926/8003/files/poguxed.pdf
    • https://cdn.shopify.com/s/files/1/0434/4443/7142/files/89078393101.pdf
    • https://cdn.shopify.com/s/files/1/0440/9229/3272/files/67535209996.pdf
    • https://cdn.shopify.com/s/files/1/0428/1755/2543/files/causes_of_ebola_virus_disease.pdf
    • https://cdn.shopify.com/s/files/1/0437/8922/2045/files/badegamev.pdf
    • https://cdn.shopify.com/s/files/1/0432/0329/7438/files/6305149992.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/84005007378.pdf
    • https://cdn.shopify.com/s/files/1/0429/6772/8279/files/bubekizowe.pdf
    • https://cdn.shopify.com/s/files/1/0432/8462/7614/files/52279887685.pdf
    • https://cdn.shopify.com/s/files/1/0434/8870/6717/files/o_que__abordagem_centrada_na_pessoa.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_off00005ca6.bin
c1b48c05f9681b9cbc2a01a449660948988ece3a33bdc0f19913dbfca6aeca42		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5CA6 5432 bytes
font_01_sfnt_off00006f29.bin
3e662b991379682326dd3ce798308e669e9dceaa7c830ab753f8e7900cff5e2d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F29 10136 bytes

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