Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c5285182d412817…

MALICIOUS

PDF

37.9 KB Created: 2020-08-29 02:38:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f12a1a191d29c1419e486799b49fda71 SHA-1: 71e337480e98958a34895fa702a3e6d189ad0734 SHA-256: 9c5285182d4128173bde61745c76ba9523da7840769ebfa07eff5b7879a5bdcc
152 Risk Score

Malware Insights

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

The PDF file contains multiple embedded links, one of which points to a known malicious redirector (ttraff.cc). The document body, though heavily obfuscated, contains the same URL and a reference to 'thank you mr falker questions', suggesting a lure. The presence of a link farm with numerous Shopify-hosted PDFs, combined with the malicious redirector, indicates a likely attempt to drive traffic to a malicious destination, possibly for phishing or malware delivery.

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/wix?keyword=thank+you+mr+falker+questions
    • https://cdn.shopify.com/s/files/1/0431/1734/6965/files/39954551804.pdf
    • https://cdn.shopify.com/s/files/1/0431/5299/8556/files/63441926012.pdf
    • https://cdn.shopify.com/s/files/1/0438/0046/1472/files/zensar_aptitude_questions_with_answers.pdf
    • https://cdn.shopify.com/s/files/1/0433/6749/7884/files/24712183428.pdf
    • https://cdn.shopify.com/s/files/1/0433/5288/3352/files/87090409010.pdf
    • https://cdn.shopify.com/s/files/1/0437/0667/9447/files/gazofoxokibevedevap.pdf
    • https://cdn.shopify.com/s/files/1/0438/3604/7525/files/56131043901.pdf
    • https://cdn.shopify.com/s/files/1/0433/5045/8520/files/jiluparaxefutulad.pdf
    • https://cdn.shopify.com/s/files/1/0429/1044/9820/files/annual_book_astm_standards.pdf
    • https://cdn.shopify.com/s/files/1/0435/5345/6289/files/assistant_executive_engineer_short_form.pdf
    • https://cdn.shopify.com/s/files/1/0433/0710/6462/files/97019588223.pdf
    • https://cdn.shopify.com/s/files/1/0440/9376/7832/files/ledotexarika.pdf
    • https://static.usrfiles.com/ugd/b8c837_712dbd5c204d4b4094da27ff0538d1a6.pdf
    • https://static.usrfiles.com/ugd/b8c837_d628ed0e895649dd89fe66bc85ae17fc.pdf
    • https://static.usrfiles.com/ugd/b8c837_58b7e4850838496eb32d9c499e85cc11.pdf
    • https://static.usrfiles.com/ugd/b8c837_0b7ea52f661440188443e6796643502e.pdf
    • https://static.usrfiles.com/ugd/b8c837_fae9ca00ce134c25baf418245a62528c.pdf
    • http://www.readwritethink.org/classroom-resources/lesson-plans/digging-deeper-developing-comprehensi
    • 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_off00005654.bin
fd164741ddee3f2bc977e89a28f6ee444cc3ff2872d5bef25640843010a4de07		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5654 5248 bytes
font_01_sfnt_off00006809.bin
2e5a5bf9c697c9bf25b5a8542e2920924c4657f29515a0662857942d85225c93		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6809 10208 bytes

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