Malicious PDF — malware analysis report

Static analysis result for SHA-256 918caa70c14289ab…

MALICIOUS

PDF

40.2 KB Created: 2020-08-29 00:09:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e83679147469bfc1e81bcc5abc3c17e1 SHA-1: 9c6b8824a37c5866cac66cc072223d3ef339d99c SHA-256: 918caa70c14289ab21cbba5dadd286eec77895110a6a930f3ec371738e747c87
154 Risk Score

Malware Insights

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

The PDF contains a high number of embedded links, many pointing to Shopify domains, suggesting a link farm or SEO manipulation tactic. One critical heuristic identified a link to a known malicious redirector at 'ttraff.com'. The document body, though heavily obfuscated, contains the same suspicious URL, reinforcing the malicious intent. The ML classifier 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.com/wix?keyword=pumpkin+don%2527t+starve
    • https://static.usrfiles.com/ugd/b8c837_ad6c75197fe849a4a8c39df611127de6.pdf
    • https://static.usrfiles.com/ugd/b8c837_a3912266a6694ec7a4038ccb1f1778ca.pdf
    • https://static.usrfiles.com/ugd/b8c837_eda7c594d0324581b93b3598a1df4084.pdf
    • https://static.usrfiles.com/ugd/b8c837_8e04610e10ff46a4b195ffd7d0581162.pdf
    • https://cdn.shopify.com/s/files/1/0435/5322/6913/files/70746647865.pdf
    • https://cdn.shopify.com/s/files/1/0432/7201/1941/files/sisowapilug.pdf
    • https://cdn.shopify.com/s/files/1/0440/6883/1382/files/astronomia_definicion.pdf
    • https://cdn.shopify.com/s/files/1/0435/8724/0093/files/59406937546.pdf
    • https://cdn.shopify.com/s/files/1/0437/3318/8769/files/bsc_zoology_syllabus.pdf
    • https://cdn.shopify.com/s/files/1/0464/1672/4136/files/twilight_online_movie_in_hindi.pdf
    • https://cdn.shopify.com/s/files/1/0433/9499/0231/files/50045728723.pdf
    • https://cdn.shopify.com/s/files/1/0446/9224/2588/files/iob_atal_pension_yojana_form.pdf
    • https://cdn.shopify.com/s/files/1/0428/1538/9855/files/morozuxim.pdf
    • https://cdn.shopify.com/s/files/1/0432/1899/3307/files/common_adjectives_and_adverbs_list.pdf
    • https://cdn.shopify.com/s/files/1/0435/8920/6174/files/palana.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_off00005ecc.bin
9f6f17f1a841c41dfce9837e3738d234456016eed641085878f375f72cb8fb2f
pdf-font-stream PDF embedded font (sfnt) at offset 0x5ECC 5232 bytes
font_01_sfnt_off00007087.bin
edf805d660dc61d43feda39b419c3054f661743943ff1d7792a4a36b23835c86
pdf-font-stream PDF embedded font (sfnt) at offset 0x7087 10420 bytes