Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c17cff01218dc46…

MALICIOUS

PDF

41.1 KB Created: 2020-07-31 13:21:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dabd1dcddac83afd49d6bb39b37c19e1 SHA-1: 80be65a82e1b8a71127e2c8f329d80de5431124c SHA-256: 5c17cff01218dc46ead79ba5f7a42aacda6be36b2e81012d2b4e2f283ebcef1f
154 Risk Score

Malware Insights

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

The PDF contains numerous links to external resources, with one critical heuristic identifying a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, suggests a lure related to a 'testheft'. The presence of embedded URLs and the ML classifier's high confidence score indicate a malicious intent to redirect users to potentially harmful content. No scripts were extracted, but the overall structure and link farm suggest a phishing or malware distribution attempt.

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=berliner+platz+3+testheft+pdf
    • http://files.indochineonline.com/uploads/1/3/1/6/131606674/1936015.pdf
    • http://files.grapesociety.org/uploads/1/3/1/4/131453429/kajifakozekaroj.pdf
    • http://files.lunnsgardencenter.com/uploads/1/3/1/4/131454012/1459437.pdf
    • http://files.oohdelolli.com/uploads/1/3/0/9/130969429/5986780.pdf
    • http://files.crossroads-university.com/uploads/1/3/2/7/132710784/zelejul.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/4277/4935/files/61657411825.pdf
    • https://cdn.shopify.com/s/files/1/0437/6815/2216/files/48702210477.pdf
    • https://cdn.shopify.com/s/files/1/0427/6633/6167/files/62686931121.pdf
    • https://cdn.shopify.com/s/files/1/0439/4316/6107/files/zonepikumifu.pdf
    • https://cdn.shopify.com/s/files/1/0440/4989/1478/files/zukipuzexibageturubo.pdf
    • https://cdn.shopify.com/s/files/1/0431/0587/8173/files/90706029604.pdf
    • https://cdn.shopify.com/s/files/1/0435/1026/8068/files/8148528216.pdf
    • https://cdn.shopify.com/s/files/1/0432/6332/8411/files/60110620008.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/lugapib.pdf
    • https://cdn.shopify.com/s/files/1/0431/7285/5967/files/49851905201.pdf
    • https://cdn.shopify.com/s/files/1/0428/8688/9639/files/71820602331.pdf
    • https://cdn.shopify.com/s/files/1/0433/8450/4474/files/fariwokox.pdf
    • https://cdn.shopify.com/s/files/1/0427/9438/5575/files/gilajililixijereja.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/wurawosupamajo.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_off00005c80.bin
12f38a11ef9bb118f1c183066f568fa7c475338294594788446531d1f1a17e58		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C80 5068 bytes
font_01_sfnt_off00006dab.bin
78489329fe8571a0677c901caf5d14f6ce4e2ea3d59217bcd04b829e84a205e5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6DAB 12848 bytes

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