Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cf7f203b7c44465…

MALICIOUS

PDF

47.3 KB Created: 2020-08-11 15:00:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1576ba225b0a3ee85059424a8f9153be SHA-1: faf45386098506239b01b4d83aff53718f40d2dd SHA-256: 9cf7f203b7c44465fb0767ec07eae73245891a38e2ab184af73373557094a1b9
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.com/pify?keyword=biology+pdf+class+11'. It also exhibits characteristics of a PDF link farm, with numerous external links, many hosted on Shopify. The document body, though heavily obfuscated, contains the same lure text and URLs, reinforcing the malicious intent. No scripts were extracted, but the primary attack vector appears to be social engineering via a deceptive link.

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=biology+pdf+class+11
    • http://sokoxon.communityland.org/uploads/1/3/1/8/131872225/gibinatoraniwemijiw.pdf
    • http://venoba.sentinelfarm.com/uploads/1/3/1/4/131407241/tudisefizejodimo.pdf
    • http://lavevuji.pos-thinking.com/uploads/1/3/1/3/131379578/61458c11f.pdf
    • http://files.inthisornfoods.com/uploads/1/3/1/3/131398085/pevejij-pobotu.pdf
    • https://cdn.shopify.com/s/files/1/0437/4459/2021/files/pogixefa.pdf
    • https://cdn.shopify.com/s/files/1/0435/2301/4824/files/panasonic_6._0_plus_manual.pdf
    • https://cdn.shopify.com/s/files/1/0433/2313/0009/files/61699105536.pdf
    • https://cdn.shopify.com/s/files/1/0433/0048/7332/files/20914678421.pdf
    • https://cdn.shopify.com/s/files/1/0431/1734/6965/files/kopegekufasaxe.pdf
    • https://cdn.shopify.com/s/files/1/0432/3295/2477/files/33609705608.pdf
    • https://cdn.shopify.com/s/files/1/0430/5689/0013/files/xijojujepo.pdf
    • https://cdn.shopify.com/s/files/1/0430/4646/9793/files/bibizozalezuxubisim.pdf
    • https://cdn.shopify.com/s/files/1/0435/9569/4239/files/java_technical_interview_cheat_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0431/1423/4016/files/shankar_ias_environment_and_ecology_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/4839/4142/files/82718678727.pdf
    • https://cdn.shopify.com/s/files/1/0429/2807/9004/files/brothers_grimm.pdf
    • https://cdn.shopify.com/s/files/1/0434/4381/4560/files/50195184948.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_off00007b6b.bin
24690e92fb89d2e5140c966e53e1e8989ec316bd5bf918931033c457a5788f7d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B6B 5432 bytes
font_01_sfnt_off00008e09.bin
ef5932cf0517d49f88815d64ada40857a1a8f964367bae5002e7cdd8b73efc27		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8E09 10040 bytes

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