Malicious PDF — malware analysis report

Static analysis result for SHA-256 9dbc2ee5a95d974b…

MALICIOUS

PDF

49.6 KB Created: 2020-08-30 21:47:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 15a76b878445399367418065f5a4ee29 SHA-1: e9d10f4ef01c5cf0782cb22d234493f51983ec4f SHA-256: 9dbc2ee5a95d974bbb94d33522e69852ce428a8616445d2d6ae062265d43b656
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.club/wix?keyword=the+chicago+manual+of+style+17th+ed'. This indicates the document's primary purpose is to redirect users to a potentially harmful site. The presence of numerous other links hosted on cdn.shopify.com, while individually benign, contributes to a link farm strategy. The ML classifier also 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.club/wix?keyword=the+chicago+manual+of+style+17th+ed
    • https://cdn.shopify.com/s/files/1/0432/8413/6086/files/44091937652.pdf
    • https://cdn.shopify.com/s/files/1/0432/6424/5922/files/kerala_beef_recipes_in_malayalam.pdf
    • https://cdn.shopify.com/s/files/1/0431/7495/3124/files/calculus_10th_edition_larson_and_edwards.pdf
    • https://cdn.shopify.com/s/files/1/0433/1008/8357/files/rarexa.pdf
    • https://cdn.shopify.com/s/files/1/0436/9874/9608/files/amazon_aws_certified_developer_associate_exam_questions.pdf
    • https://cdn.shopify.com/s/files/1/0432/2931/5229/files/46065514205.pdf
    • https://cdn.shopify.com/s/files/1/0430/0803/2922/files/xofakazopitajagulowig.pdf
    • https://cdn.shopify.com/s/files/1/0436/1489/6290/files/laundry_symbols.pdf
    • https://cdn.shopify.com/s/files/1/0440/1748/3934/files/jidorexomipemodidaze.pdf
    • https://cdn.shopify.com/s/files/1/0431/5283/4711/files/45075426950.pdf
    • https://cdn.shopify.com/s/files/1/0436/0637/6611/files/resumo_por_capitulo_capites_da_areia.pdf
    • https://cdn.shopify.com/s/files/1/0431/0433/8074/files/fke_dans_ok.pdf
    • https://cdn.shopify.com/s/files/1/0440/2616/7461/files/98538795833.pdf
    • https://cdn.shopify.com/s/files/1/0436/9884/7896/files/sugom.pdf
    • https://cdn.shopify.com/s/files/1/0428/6378/8188/files/16285634690.pdf
    • https://cdn.shopify.com/s/files/1/0434/6016/5797/files/38390547692.pdf
    • https://cdn.shopify.com/s/files/1/0429/5363/8044/files/sorting_algorithm_tutorial.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_off000082d2.bin
fc4bd28a8166102a39127a68ce6550223df5bc2544ded91f1bc1d72c9e209ea2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x82D2 5524 bytes
font_01_sfnt_off00009595.bin
45716450ecb2b72a42e54dacf4b5080282f464c5ec0bc9a4cd50ff06c6d5abb7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9595 10608 bytes

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