Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d79755d5fa92b8b…

MALICIOUS

PDF

45.8 KB Created: 2020-08-19 00:50:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4217836acb27f4fd0762b92c58ca8d6e SHA-1: 01ab7fb570870bc99c8deffdc73eeb836e523b6a SHA-256: 6d79755d5fa92b8b9a1b35093eb5a95d54dc5522804f64ffee9f46765ab740f8
154 Risk Score

Malware Insights

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

The PDF contains a link disguised as 'electrical engineering internship interview questions and answers' that redirects to malicious infrastructure. This indicates a phishing or scam attempt, likely delivered as a spearphishing attachment. The PDF also contains a large number of links to other PDFs, suggesting a link farm or SEO manipulation tactic to increase visibility.

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.cc/pify?keyword=electrical+engineering+internship+interview+questions+and+answers
    • http://files.encompass-supports.com/uploads/1/3/1/4/131408415/7240815.pdf
    • http://files.gocaptiva.com/uploads/1/3/1/3/131380723/424350.pdf
    • http://wituvoxaj.sometimesbooks.com/uploads/1/3/1/4/131407227/tasamid_forowijuwosa_runul_wowobobaju.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0427/9091/2159/files/maxusug.pdf
    • https://cdn.shopify.com/s/files/1/0430/7881/1810/files/automotive_technology_4th_edition_free.pdf
    • https://cdn.shopify.com/s/files/1/0430/8910/0951/files/jamebabo.pdf
    • https://cdn.shopify.com/s/files/1/0430/3159/3113/files/33187687627.pdf
    • https://cdn.shopify.com/s/files/1/0429/6910/4540/files/82586056088.pdf
    • https://cdn.shopify.com/s/files/1/0434/5564/3809/files/48169717856.pdf
    • https://cdn.shopify.com/s/files/1/0430/6560/6301/files/printable_shooting_targets.pdf
    • https://cdn.shopify.com/s/files/1/0428/9485/2252/files/vumojesolajapejajedenar.pdf
    • https://cdn.shopify.com/s/files/1/0429/5468/6617/files/clearone_beamforming_mic_array_ceiling_tile.pdf
    • https://cdn.shopify.com/s/files/1/0432/4173/4311/files/namopis.pdf
    • https://cdn.shopify.com/s/files/1/0434/5207/2086/files/20087249089.pdf
    • https://cdn.shopify.com/s/files/1/0430/6790/0061/files/67735268939.pdf
    • https://cdn.shopify.com/s/files/1/0437/4416/6037/files/93936696478.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007444.bin
30346cfcbdedd3d82f409ef53da36df2a32e30af80ad0ae77f23f0a7daaee427		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7444 5572 bytes
font_01_sfnt_off00008733.bin
5dc3c632c008391101ae256fd75468a38388e30205a86c2ec1ccfaa72454079c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8733 10240 bytes

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