Malicious PDF — malware analysis report

Static analysis result for SHA-256 a31ee1ab4989b417…

MALICIOUS

PDF

33.7 KB Created: 2020-08-12 02:53:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6a8109e57ceed8099966fdca6f0a2d56 SHA-1: 71327a8e239dadd6c07b011899bf163c4d743435 SHA-256: a31ee1ab4989b417c630375e6dd47d87e0396b8a49ee32b37153dc9dd17721d0
120 Risk Score

Malware Insights

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

The PDF contains a mass of external links, with one critical heuristic identifying a link to a known malicious redirector. The document body, though heavily corrupted, contains text that appears to be a lure for a 'caste certificate form download', and the primary malicious URL is associated with this lure. The presence of numerous Shopify links suggests an attempt to blend malicious links with seemingly benign content, a common tactic for SEO poisoning.

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=caste+certificate+form+download+pdf+jharkhand
    • http://files.waterloohouseporcelain.com/uploads/1/3/2/8/132814219/ea1a03a.pdf
    • http://files.tangwenfang.org/uploads/1/3/2/7/132740350/folatokaba-vopaborixoneno-wokuron-rewebudenife.pdf
    • http://files.rihousegop.org/uploads/1/3/2/3/132303081/b4877d78ae4d10.pdf
    • https://cdn.shopify.com/s/files/1/0434/2664/4125/files/plant_ecology_lecture_notes.pdf
    • https://cdn.shopify.com/s/files/1/0435/7138/0383/files/bubble_sort_in_c.pdf
    • https://cdn.shopify.com/s/files/1/0430/2841/4618/files/84380003698.pdf
    • https://cdn.shopify.com/s/files/1/0430/8733/1481/files/ctet_syllabus_2020_6_to_8.pdf
    • https://cdn.shopify.com/s/files/1/0430/8529/9876/files/77234024926.pdf
    • https://cdn.shopify.com/s/files/1/0437/6651/3818/files/58728330326.pdf
    • https://cdn.shopify.com/s/files/1/0431/9654/7230/files/jomogonatuk.pdf
    • https://cdn.shopify.com/s/files/1/0434/6540/8662/files/50810422831.pdf
    • https://cdn.shopify.com/s/files/1/0438/3080/4642/files/bartleby_melville.pdf
    • https://cdn.shopify.com/s/files/1/0434/0210/0886/files/jejikemefug.pdf
    • https://cdn.shopify.com/s/files/1/0437/0753/1432/files/55271513548.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_off0000468e.bin
8d4177d116fabb29f848d59ee11c500ebc818dc50310ebc5a56e683fb705e282		 pdf-font-stream PDF embedded font (sfnt) at offset 0x468E 5532 bytes
font_01_sfnt_off0000593e.bin
cd27bccc9c0b86171b339223fbeca009d172c222484e4c048e08e6e5d37e4111		 pdf-font-stream PDF embedded font (sfnt) at offset 0x593E 9528 bytes

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