Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c83ff5e1c139079…

MALICIOUS

PDF

46.5 KB Created: 2020-08-09 16:51:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3ad09509b4858689875ab724c1f51c55 SHA-1: 499e9008674f3cb51f3f70d4127327ab3dec5d3b SHA-256: 6c83ff5e1c139079d063aa58862fc5dfa8b26f2c812942cd875c823b4f1d12cb
162 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to Shopify domains hosting other PDFs, but one critical link redirects to a known malicious domain. The document body, though heavily obfuscated, contains the text 'Tamil jothidam books pdf free download' and the malicious URL, suggesting a lure for users seeking free content. The ML classifier strongly flagged this PDF as malicious, and the presence of a redirector link indicates a phishing or malware distribution attempt.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=tamil+jothidam+books+pdf+free+download
    • http://files.jodisnailspa.com/uploads/1/3/1/4/131438759/dosorinoxipifava.pdf
    • http://files.artofandrewchesworth.com/uploads/1/3/1/3/131398517/05f40b497198bf6.pdf
    • http://files.rengyosoh.com/uploads/1/3/0/9/130969446/47917d54143e.pdf
    • http://fedorahosted.org/lohit
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0440/2541/3782/files/content_analysis_and_discourse_analysis.pdf
    • https://cdn.shopify.com/s/files/1/0432/9635/8565/files/napigivopupib.pdf
    • https://cdn.shopify.com/s/files/1/0430/6285/3794/files/46466550021.pdf
    • https://cdn.shopify.com/s/files/1/0433/9623/5415/files/cv_sample_for_teaching_job.pdf
    • https://cdn.shopify.com/s/files/1/0435/6410/5886/files/98240722172.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/bijalikupuxamimidesedol.pdf
    • https://cdn.shopify.com/s/files/1/0437/7929/3338/files/pobonuzakobuvuwe.pdf
    • https://cdn.shopify.com/s/files/1/0429/7680/5023/files/sadojuri.pdf
    • https://cdn.shopify.com/s/files/1/0430/6819/4978/files/bexapoxepedafe.pdf
    • https://cdn.shopify.com/s/files/1/0432/8721/6293/files/livonefopokapobewu.pdf
    • https://cdn.shopify.com/s/files/1/0447/2376/5402/files/annales_bac_maths_s_corrigs.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
stream_004_off00006773.bin
4b1200315ff4afcdb679507ff086c06079b77255a1564bf62ef5a2f4b197be1f		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x6773 15320 bytes
font_00_sfnt_off00005490.bin
cbbfc67bf7e2fb765ce0ce39bf0312da5aed9443931aad6048c67d65451c4e81		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5490 5600 bytes
font_02_sfnt_off00008af3.bin
2a1bab6455d9b0a18632b073c602cc00e3e1b80dcb5677d47cf5604c0a810297		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8AF3 9896 bytes

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