Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfaf3b7811e16983…

MALICIOUS

PDF

52.4 KB Created: 2020-07-30 20:52:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1fb2f7631ee7b6d781cbb948c2741e65 SHA-1: 64dc95786cbd1f4cbc0ee06754fc1329a7748559 SHA-256: bfaf3b7811e16983e5495b97d953827ac179179c2ba3ba28c582a1fc965ab6ab
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF file contains embedded links that point to a known malicious redirector (ttraff.com). The document body, though heavily obfuscated, appears to be a lure related to a "12th zoology textbook pdf". The presence of numerous external PDF links, many hosted on cdn.shopify.com, suggests a link farm or SEO poisoning tactic to distribute the malicious content. The ML classifier strongly indicates maliciousness.

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=12th+zoology+textbook+pdf
    • http://files.joeytorresphd.com/uploads/1/3/1/4/131438069/595522a07.pdf
    • http://files.annegreenephotography.com/uploads/1/3/1/6/131607075/2aec3610a705.pdf
    • http://files.peechline.com/uploads/1/3/0/7/130776864/9141700.pdf
    • http://files.cbd-uk.shop/uploads/1/3/1/4/131438059/d18633e8.pdf
    • http://files.c3churchnorthcity.com/uploads/1/3/2/8/132816165/tefekugut-tutumiral-sovofikibo-vefizugukomisa.pdf
    • http://files.c3churchnorthcity.com/uploads/1/3/2/8/132816165/tefekugut-tutumiral-sovofikibo-vefizugu
    • https://cdn.shopify.com/s/files/1/0434/7258/4861/files/wiguzunevusifasutaku.pdf
    • https://cdn.shopify.com/s/files/1/0438/6121/3344/files/xodidesolozedip.pdf
    • https://cdn.shopify.com/s/files/1/0433/7133/1742/files/rupetok.pdf
    • https://cdn.shopify.com/s/files/1/0430/2848/0157/files/4621971052.pdf
    • https://cdn.shopify.com/s/files/1/0427/7462/6470/files/72665289368.pdf
    • https://cdn.shopify.com/s/files/1/0432/9088/6312/files/87656540298.pdf
    • https://cdn.shopify.com/s/files/1/0440/9737/2312/files/vobedekomixuvukobatotaxo.pdf
    • https://cdn.shopify.com/s/files/1/0429/2280/3363/files/5022820732.pdf
    • https://cdn.shopify.com/s/files/1/0432/9072/2469/files/22732748746.pdf
    • https://cdn.shopify.com/s/files/1/0428/7509/3159/files/rebiredazarejiz.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_off0000758e.bin
b714b8caa11caca5d9d1a37ad8326cce5f2ab3a0ff0f9a913c071b563cedc829		 pdf-font-stream PDF embedded font (sfnt) at offset 0x758E 4968 bytes
font_01_sfnt_off000086a6.bin
4a72428de20acecee5e88754244c40c0f612e0afeb709ad81c8792abc0cd21fc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x86A6 10588 bytes
font_02_sfnt_off0000ab1d.bin
8ad3ca3cdaf1487e292077c013af2bc2ba419d1b09688aa3df74896e0b35b1b6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAB1D 7516 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.