Malicious PDF — malware analysis report

Static analysis result for SHA-256 e605f281e44b6c7d…

MALICIOUS

PDF

46.5 KB Created: 2020-07-24 10:44:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d2ab9353bcca1fe6ebef13a772843f4a SHA-1: cc155af7bcd1f2c76ffb0c08714782f6d0f7d3a2 SHA-256: e605f281e44b6c7d2417236c01bdd134ad3d0153074362f3d0795a9fbec605be
152 Risk Score

Malware Insights

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

The PDF contains numerous links, identified as a link farm, with one prominent link pointing to a known malicious redirector. The document body, though heavily obfuscated, appears to be related to 'community medicine mcqs with answers pdf', serving as a lure. The ML classifier strongly indicates maliciousness, and the PDF_MALICIOUS_REDIRECTOR_LINK heuristic confirms the presence of a link to malicious infrastructure.

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.com/pify?keyword=community+medicine+mcqs+with+answers+pdf
    • http://files.christinachrysanthopoulou.com/uploads/1/3/1/3/131384470/eb9fb16.pdf
    • http://files.mrrizzi.com/uploads/1/3/1/1/131163761/1969364.pdf
    • http://files.gavrielrosenfeld.com/uploads/1/3/0/7/130776401/78a3b07b285d46.pdf
    • http://files.ktskinandbeauty.co.uk/uploads/1/3/0/7/130776476/ravezoreviviziwovuk.pdf
    • http://files.christinewatkinsart.com/uploads/1/3/1/6/131606540/vujomalalol.pdf
    • https://cdn.shopify.com/s/files/1/0433/3089/6026/files/98305121847.pdf
    • https://cdn.shopify.com/s/files/1/0432/9802/9733/files/sanaw.pdf
    • https://cdn.shopify.com/s/files/1/0437/0500/8293/files/15817528018.pdf
    • https://cdn.shopify.com/s/files/1/0429/5547/3059/files/dadolenozuwiputoge.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/dilos.pdf
    • https://cdn.shopify.com/s/files/1/0430/5725/0455/files/22041562559.pdf
    • https://cdn.shopify.com/s/files/1/0433/4868/9050/files/guputiwekolevosapokam.pdf
    • https://cdn.shopify.com/s/files/1/0431/6289/4498/files/24531862368.pdf
    • https://cdn.shopify.com/s/files/1/0429/1588/9305/files/3759917646.pdf
    • https://cdn.shopify.com/s/files/1/0431/1659/3312/files/24310906536.pdf
    • https://cdn.shopify.com/s/files/1/0430/4447/0933/files/zegebolajarilebo.pdf
    • https://cdn.shopify.com/s/files/1/0434/5207/2086/files/falovu.pdf
    • https://cdn.shopify.com/s/files/1/0430/6577/0135/files/faretexowetiwavinurusesuz.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006db5.bin
48acd444d36e1b8e04dd127465e0436e38eb2cd03139839f3aac04b4c3be6e99		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6DB5 1664 bytes
font_01_sfnt_off000075ab.bin
22ffc80c46f51fe9a3db48937307a0bb42b4db409f4d84d49f1a7f409746039e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x75AB 5588 bytes
font_02_sfnt_off00008893.bin
c971984bdabac305ebf0d0a9728ac5c1d9350cc7315cffcf13f3a28495210937		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8893 10420 bytes

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