Malicious PDF — malware analysis report

Static analysis result for SHA-256 b12b3fa24a617f61…

MALICIOUS

PDF

53.9 KB Created: 2020-08-11 17:29:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0a8d766d92183f5f31c012aa62c5bbf1 SHA-1: 0339df481cd7eaa8d72d4c2a36a6cd392a00df4b SHA-256: b12b3fa24a617f610dc82800ab8cbd3f6cc79832c1b73498c082170d49e55b3f
152 Risk Score

Malware Insights

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

The PDF was flagged as malicious due to a high number of embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains the URL 'https://ttraff.ru/pify?keyword=mathematics+of+finance+pearson+pdf', which is a strong indicator of a phishing or redirection attempt. The presence of numerous other links hosted on cdn.shopify.com and other domains further supports the attack pattern of a link farm designed to distribute malicious content.

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/pify?keyword=mathematics+of+finance+pearson+pdf
    • http://files.mrappa.com/uploads/1/3/1/4/131483778/4341984.pdf
    • http://files.oldmanmoney.com/uploads/1/3/0/8/130813732/jinovobawobukum-sefugumadulub.pdf
    • http://files.nikkisdance.com/uploads/1/3/1/6/131606092/6084307.pdf
    • https://cdn.shopify.com/s/files/1/0432/9324/5590/files/wibek.pdf
    • https://cdn.shopify.com/s/files/1/0435/7170/8065/files/breath_of_the_wild_official_guide.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/71860998709.pdf
    • https://cdn.shopify.com/s/files/1/0430/9273/8201/files/63198688575.pdf
    • https://cdn.shopify.com/s/files/1/0429/4079/2999/files/tenikugifivofebedobesopo.pdf
    • https://cdn.shopify.com/s/files/1/0435/8720/7327/files/bobbin_lace_books_free.pdf
    • https://cdn.shopify.com/s/files/1/0429/6015/8873/files/bajavidivatisawi.pdf
    • https://cdn.shopify.com/s/files/1/0432/5369/4626/files/85214311042.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/7868051279.pdf
    • https://cdn.shopify.com/s/files/1/0435/7344/4767/files/wesodunoxorepidagamimen.pdf
    • https://cdn.shopify.com/s/files/1/0434/1907/4722/files/puwezivudopu.pdf
    • https://cdn.shopify.com/s/files/1/0428/8145/0147/files/tagojovizolijewuxek.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006b3d.bin
04d881681e0e0317e2efc38c98cbb6b06fcd23323fdb70f0a02cf4681119df7e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B3D 5368 bytes
font_01_sfnt_off00007d55.bin
8cf7c8ae05623489805b5cf892f4d29a0511163c154e143cb66f7a3f6c8293dd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D55 2256 bytes
font_02_sfnt_off000086e3.bin
882cb79f38a263863a6e92c3cf4f38c498b59ecd9153bbddd72b6c20d11148d2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x86E3 14804 bytes
font_03_sfnt_off0000b547.bin
84d5bd19c210eb3b73ecc14096ab1e56fdfb5b80ce7ba4f0052c67c0c2b02727		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB547 16060 bytes

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