Malicious PDF — malware analysis report

Static analysis result for SHA-256 73bd929adbd3f641…

MALICIOUS

PDF

42.6 KB Created: 2020-08-09 07:40:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1e07ea783bd1e4631c3e9a5bf0e05764 SHA-1: f7fcee44e8053b0dc2a884d4c13750f81e8d684a SHA-256: 73bd929adbd3f6413fc7b0b9745513c94005365e86d2ecd7904aeadfc62b8774
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.com, disguised with a keyword related to educational material. The document also contains a large number of links to other PDFs, suggesting a link farm or SEO manipulation tactic. While no scripts were explicitly extracted, the presence of embedded URLs and the malicious redirector strongly indicate an attempt to lead the user to malicious content, likely for phishing or malware distribution.

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=wordly+wise+3000+book+5+lesson+pdf
    • http://files.riversidetroutfishing.net/uploads/1/3/1/0/131070051/8e75188b31b1ca7.pdf
    • http://files.manillashowsociety.net/uploads/1/3/1/1/131163684/5709582.pdf
    • http://files.cyfairbrigade.net/uploads/1/3/0/7/130775506/679255.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/5004/9448/files/33817016155.pdf
    • https://cdn.shopify.com/s/files/1/0429/1254/6975/files/2004_polaris_sportsman_500_service_manual.pdf
    • https://cdn.shopify.com/s/files/1/0438/4423/9510/files/kadidad.pdf
    • https://cdn.shopify.com/s/files/1/0431/7921/2959/files/turbo_cleaner_boost_clean.pdf
    • https://cdn.shopify.com/s/files/1/0433/7329/7814/files/jubepudirategew.pdf
    • https://cdn.shopify.com/s/files/1/0432/6152/6166/files/kopujilaj.pdf
    • https://cdn.shopify.com/s/files/1/0445/8535/3380/files/jspdf_autotable_horizontal_headers.pdf
    • https://cdn.shopify.com/s/files/1/0435/7508/3167/files/benefits_of_budgetary_control.pdf
    • https://cdn.shopify.com/s/files/1/0428/4982/9023/files/9872372014.pdf
    • https://cdn.shopify.com/s/files/1/0434/1514/2551/files/likuwav.pdf
    • https://cdn.shopify.com/s/files/1/0445/6543/0431/files/dipleurula_concept_of_origin_of_chordates.pdf
    • https://cdn.shopify.com/s/files/1/0434/0521/3846/files/fubozivexavawujotojimi.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_off00006684.bin
6ff57509442fc05d1f53d026e1d52e30d92123f98e09d8e1ed39fd5d34b03100		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6684 5664 bytes
font_01_sfnt_off000079fe.bin
ba34b237f1027cca889c515ee9a2ba94c1c3f5182014495f119fe526316cdbf5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x79FE 10508 bytes

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