Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc5ef9198fb2456c…

MALICIOUS

PDF

48.5 KB Created: 2020-09-05 17:59:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 679e328830aabc11fafb4fbe8d260086 SHA-1: 619b92cdbdd25b3a84a77b291fb31bf032eb4fb7 SHA-256: fc5ef9198fb2456c3a00c92c1a98d859f23a38bb98f665338a86dd776af9e392
154 Risk Score

Malware Insights

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

The PDF contains a link disguised as a 'personal finance management excel sheet' that redirects to a malicious URL. This heuristic, combined with the ML classifier flagging the PDF as malicious, strongly suggests a phishing or redirection attempt. The PDF also contains a large number of links, indicating it's part of a link farm designed to improve SEO for malicious content.

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=personal+finance+management+excel+sheet In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static.usrfiles.com/ugd/c63dba_aec72341c9514948bec92605a99e9d4d.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/4d548e_39f0fef0f77d4818be2bd8c97ec61b0c.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/e1a791_9449e4d3cfa44998a51f357f11af8810.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/4dbf3f_ed61c46e25e04f9a807d6f0dfadf89e4.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0462/0179/8809/files/pumujeraxis.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6001/8852/files/43596280802.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/8833/8330/files/tamil_word_doc_to_converter_online.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/6484/2647/files/tezekopab.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/1848/5923/files/mcdonalds_nutrition_usa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/31082235151.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/4420/8797/files/pixutojekepapig.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1996/8417/files/15844902193.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/22271122494.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/pekazojifedabefotekufof.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/5586/6263/files/sample_student_autobiography.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0459/6534/4935/files/spotify_premium_apple.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000080a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x80A9 5364 bytes
SHA-256: 49270e48f97df67dcb6823fad7b299391aedc9dc7a2a33a445faf236ac5e9df2
font_01_sfnt_off000092c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x92C4 9964 bytes
SHA-256: a7b5c493eb331a118e18ad5c93202b8d7adf80e8b873840f14445234b68c8b30

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