Malicious PDF — malware analysis report

Static analysis result for SHA-256 837f740fd15b388c…

MALICIOUS

PDF

40.7 KB Created: 2020-08-22 01:28:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 063a6e879243f10ad2a695805a87cfd9 SHA-1: 9c4957b11221933183280b02e66aa517e08c1aaf SHA-256: 837f740fd15b388c25bb601e22ba641f4f97b8ee0c016c908cad4c736a1eded0
154 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for linking to known malicious redirector infrastructure, specifically pointing to 'ttraff.cc'. The document body, though heavily obfuscated, includes the same URL and several other URLs hosted on Shopify and a suspicious domain, suggesting a link farm or redirection attempt. The presence of embedded URLs and the ML classifier's high confidence indicate malicious intent, likely to redirect users to a phishing or malware distribution site.

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=cassadee+pope+the+voice+all+performances
    • http://fezezogim.cambridgesupervisiontraining.org/uploads/1/3/2/6/132681337/divef.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0438/8831/2488/files/terminator_6_2019.pdf
    • https://cdn.shopify.com/s/files/1/0433/2892/9960/files/nokiwurudirerelolikugaja.pdf
    • https://cdn.shopify.com/s/files/1/0436/3331/1904/files/65076768367.pdf
    • https://cdn.shopify.com/s/files/1/0432/2436/7266/files/domixakoxuwezufevugix.pdf
    • https://cdn.shopify.com/s/files/1/0432/0083/9837/files/bimimubesadosij.pdf
    • https://cdn.shopify.com/s/files/1/0432/7460/0598/files/41312795342.pdf
    • https://cdn.shopify.com/s/files/1/0431/1272/6677/files/zivuxidinu.pdf
    • https://cdn.shopify.com/s/files/1/0438/4777/8469/files/zigokogitexexuxupulijex.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_off0000613c.bin
f59b161c676ebda150440c6dd259002019d08de8c3dc2f3d6cc7c75db39dcb0f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x613C 5360 bytes
font_01_sfnt_off00007353.bin
0a7ef09fbd8714688fa7dbfce3cbb7f30175cd6198700fce46c1538e705ed7b7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7353 10556 bytes

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