Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0864ae84f1560b0…

MALICIOUS

PDF

39.0 KB Created: 2020-08-20 13:59:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3cab85943517455341c7af723523203c SHA-1: 996df589e1ca0c0c663f94f351161c0c7b3c671e SHA-256: a0864ae84f1560b05679a8381739dd33b1fceec42567bf5b6402fd53174d45da
120 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains text related to 'Calibre android client' and the malicious URL. The presence of a PDF link farm heuristic further indicates a malicious intent to distribute links, likely to lure users into a scam or phishing site.

Heuristics 3

  • 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.
  • 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=calibre+android+client
    • http://files.chappellskc.com/uploads/1/3/0/8/130873717/gamanudi-feditigojivi-damezidete-fatosososupu.pdf
    • https://cdn.shopify.com/s/files/1/0429/6278/0311/files/64600041075.pdf
    • https://cdn.shopify.com/s/files/1/0437/5347/2151/files/case_files_neurology_4th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0433/1687/1326/files/abhiman_movie_bengali.pdf
    • https://cdn.shopify.com/s/files/1/0429/8879/8111/files/61971417810.pdf
    • https://cdn.shopify.com/s/files/1/0429/5652/1631/files/css_profile_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0429/7788/6367/files/46812603049.pdf
    • https://cdn.shopify.com/s/files/1/0432/5035/2296/files/98844417298.pdf
    • https://cdn.shopify.com/s/files/1/0428/2312/3100/files/52738229237.pdf
    • https://cdn.shopify.com/s/files/1/0433/9892/2392/files/60390878654.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005c73.bin
8693bfa268c2bb43e520c43f81b574f06f4046de2679a9d6b04f8f45f8075b21		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C73 4800 bytes
font_01_sfnt_off00006cc6.bin
99e7cc923213d3267ed75e1a3ca48579c22515501df12e82eec44e408b7ddef1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6CC6 10216 bytes

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