Malicious PDF — malware analysis report

Static analysis result for SHA-256 959618a545af9d39…

MALICIOUS

PDF

42.3 KB Created: 2020-08-10 00:41:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1ec0d1786f6d0aef0b46a72574ef078a SHA-1: 3427833dc15879b5199decaaac94152727297161 SHA-256: 959618a545af9d3973eabcd6284382dd5f44212ec9274186525509b75d9888d5
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one pointing to a known malicious redirector (ttraff.com). The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the malicious URL, suggesting the intent is to redirect the user to potentially harmful content. The presence of a link farm further supports a malicious distribution strategy.

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=gym+candy+free+pdf
    • http://files.runningcrazyforever.com/uploads/1/3/0/7/130738639/nuvazujuxazizajod.pdf
    • http://buwazozo.yatesclassroom.com/uploads/1/3/1/8/131856772/9a71091f6.pdf
    • http://files.thesilvergoddessjoanib.com/uploads/1/3/1/4/131453615/xisekopud.pdf
    • http://zavad.whiteschapelumc.com/uploads/1/3/2/6/132681670/bc553688.pdf
    • http://files.yayacanada.ca/uploads/1/3/1/0/131070452/mebijomoki-pokukelilo-jesopusazoxe.pdf
    • https://cdn.shopify.com/s/files/1/0428/1437/4054/files/wetajiwufewapuwi.pdf
    • https://cdn.shopify.com/s/files/1/0431/1855/9389/files/52037468010.pdf
    • https://cdn.shopify.com/s/files/1/0437/2869/9553/files/oxford_arabic_dictionary.pdf
    • https://cdn.shopify.com/s/files/1/0431/6338/6016/files/jiruvux.pdf
    • https://cdn.shopify.com/s/files/1/0429/7100/5082/files/kepadum.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/3294478915.pdf
    • https://cdn.shopify.com/s/files/1/0440/9671/6952/files/piwiruduroduximokixixuzoj.pdf
    • https://cdn.shopify.com/s/files/1/0435/1361/0392/files/30223324894.pdf
    • https://cdn.shopify.com/s/files/1/0427/3229/0215/files/130927906.pdf
    • https://cdn.shopify.com/s/files/1/0432/9901/2766/files/97716216262.pdf
    • https://cdn.shopify.com/s/files/1/0431/1669/1612/files/figejegozupudezidovotizek.pdf
    • https://cdn.shopify.com/s/files/1/0432/5313/7563/files/biriwobitexobabofedepu.pdf
    • https://cdn.shopify.com/s/files/1/0433/9964/3286/files/75495808906.pdf
    • https://cdn.shopify.com/s/files/1/0432/9360/6046/files/66822009342.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_off000067d2.bin
84fa8ab15dc848ded0f2945d90fb486af9c57e19159759733135964f88c14ed0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67D2 5224 bytes
font_01_sfnt_off00007995.bin
496796ec5baa93cb4fddfc004f556aa9eff2bf0e7bc666482835475f398c0170		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7995 10208 bytes

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