Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e752afd5740153f…

MALICIOUS

PDF

45.0 KB Created: 2020-08-11 03:07:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f5c9ef79b0b72147f0a2a98cd3810847 SHA-1: 7868bbb0bf4f37dd1bf13c86fba26c666ac2d2a8 SHA-256: 4e752afd5740153fc46953325fffdbbd6eb49e36e8651fa3ce2a717992ef883a
152 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link disguised as a download for interview questions. The document body and heuristics indicate a lure to a link farm, with the primary malicious URL being ttraff.com. This suggests a phishing or scam attempt to redirect users to potentially harmful 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.com/pify?keyword=desktop+support+engineer+interview+questions+pdf+download
    • http://files.radioarcana.org/uploads/1/3/1/3/131379375/6777731.pdf
    • http://wuvatifi.artsstudentsassociation.org/uploads/1/3/1/0/131070109/foselodubaguvaz_gabarejizira_xijutumizej.pdf
    • http://files.antpas.org/uploads/1/3/1/6/131606248/rifororuxe_fonim.pdf
    • https://cdn.shopify.com/s/files/1/0428/4186/6403/files/wureremiranilemubudisoji.pdf
    • https://cdn.shopify.com/s/files/1/0432/0762/2824/files/jiraropefezozebu.pdf
    • https://cdn.shopify.com/s/files/1/0433/4334/7877/files/ncert_beehive_class_9_solution.pdf
    • https://cdn.shopify.com/s/files/1/0435/0679/4651/files/tapaxof.pdf
    • https://cdn.shopify.com/s/files/1/0433/8476/6620/files/potujukiwawapajavosunit.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/46946939033.pdf
    • https://cdn.shopify.com/s/files/1/0433/0369/8600/files/pifebajedawozojoxodumosav.pdf
    • https://cdn.shopify.com/s/files/1/0428/3482/1287/files/jatazugidanajubiledipas.pdf
    • https://cdn.shopify.com/s/files/1/0434/3480/3352/files/15521924229.pdf
    • https://cdn.shopify.com/s/files/1/0431/6132/1634/files/nenejefat.pdf
    • https://cdn.shopify.com/s/files/1/0428/3518/1724/files/35268146559.pdf
    • https://cdn.shopify.com/s/files/1/0433/0065/1158/files/the_iliad_penguin.pdf
    • https://cdn.shopify.com/s/files/1/0432/1165/3277/files/writing_argumentative_essays_nancy_wood.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_off00006407.bin
b8176606f7b3ac0031cbda1fec0b89247b2d37938f4b117ee85a74314b092d05		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6407 5432 bytes
font_01_sfnt_off000076a6.bin
07d77391409c0f18f08fe8fc29a297081ba9e02e00502c4bc2eb286127efbf35		 pdf-font-stream PDF embedded font (sfnt) at offset 0x76A6 9908 bytes
font_02_sfnt_off00009893.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9893 4324 bytes

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