Malicious PDF — malware analysis report

Static analysis result for SHA-256 af031de797ac948b…

MALICIOUS

PDF

50.6 KB Created: 2020-08-05 22:44:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 21e70d243290a16862530bb1d2ca2ae9 SHA-1: b61d3cc2d4d34b35f944176bba89ef38f296f05e SHA-256: af031de797ac948b4f23b516bcef4afef1b6c6464a0a89ec9bc8feb2f322f0ea
154 Risk Score

Malware Insights

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

The PDF contains a link farm designed to appear as legitimate book resources, but the primary link redirects to malicious infrastructure. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK indicates that the initial URL, 'https://ttraff.ru/pify?keyword=read+bengali+books+online+pdf', is part of a known malicious redirector chain. The document body, though heavily obfuscated, contains text related to reading Bengali books online, reinforcing the lure. The ML classifier strongly flagged this PDF as malicious.

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.ru/pify?keyword=read+bengali+books+online+pdf
    • http://files.freshvision.org/uploads/1/3/1/3/131378942/116310.pdf
    • http://mepufatej.milesgreenberg.com/uploads/1/3/1/6/131606490/vefotonek_misomerelu_guduzinijo_lideruwuverakik.pdf
    • http://files.tktphi.net/uploads/1/3/1/6/131606373/nugobularotalosofevu.pdf
    • http://files.heroesofcolor.com/uploads/1/3/0/7/130775025/4345926.pdf
    • http://files.foundationsoffuninfirst.com/uploads/1/3/1/4/131437689/9288654.pdf
    • https://cdn.shopify.com/s/files/1/0429/4685/5078/files/93853768290.pdf
    • https://cdn.shopify.com/s/files/1/0433/6910/3528/files/86712766123.pdf
    • https://cdn.shopify.com/s/files/1/0431/1079/3382/files/bernoulli_s_theorem_experiment.pdf
    • https://cdn.shopify.com/s/files/1/0435/4077/5064/files/62285381680.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/54440827626.pdf
    • https://cdn.shopify.com/s/files/1/0428/0667/3574/files/wifi_key_recovery_without_root.pdf
    • https://cdn.shopify.com/s/files/1/0437/2011/4344/files/accounting_standard_30.pdf
    • https://cdn.shopify.com/s/files/1/0434/6406/5174/files/yamaha_golf_cart_service_manual.pdf
    • https://cdn.shopify.com/s/files/1/0435/2606/2239/files/13450465630.pdf
    • https://cdn.shopify.com/s/files/1/0433/9898/7941/files/21375259386.pdf
    • https://cdn.shopify.com/s/files/1/0431/2642/3701/files/dopenodubaxugebol.pdf
    • https://cdn.shopify.com/s/files/1/0435/7790/1214/files/46646790356.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tovetutokukike.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_off0000586a.bin
4d91ff6cac9dd983fa4b3ab9544c72fd1eb8f324b3ae2d51f59db364509aad93		 pdf-font-stream PDF embedded font (sfnt) at offset 0x586A 5324 bytes
font_01_sfnt_off00006a9d.bin
ffda891faaa49c66cb5e7ab48aad86ba38798548acf2ca1869b80070ae0252d3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A9D 11392 bytes
font_02_sfnt_off00008e61.bin
5af02e0fe3683429d278acf5af04cca5f107bdb08019e1314d23a4781924a815		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8E61 15068 bytes

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