Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6e7d439cb0ba33a…

MALICIOUS

PDF

40.3 KB Created: 2020-08-19 12:27:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 347a1a14cc284692e387d561784bcbe7 SHA-1: 7d3b58085019d8fd82bf73a9b0e0e293c7ef3fbc SHA-256: f6e7d439cb0ba33ad14ab0347b2db2c8f7a31a9effdcc64917b2f3e62902df27
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, many pointing to Shopify domains, but one critical link directs to a known malicious redirector infrastructure. This suggests the document is designed to lure users into clicking malicious links, likely for phishing or malware distribution. The ML classifier strongly supports the malicious nature of this PDF.

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/pify?keyword=kauri+coast+guided+night+forest+walk
    • http://files.phatplatter.com/uploads/1/3/1/4/131406506/nudun.pdf
    • http://files.charleybarneswriter.com/uploads/1/3/1/4/131454352/f168c.pdf
    • http://xazegomod.home4youutah.com/uploads/1/3/1/8/131856040/8440758.pdf
    • http://vivixu.alifeexplored.com/uploads/1/3/1/3/131384169/rewibuzomerefu.pdf
    • https://cdn.shopify.com/s/files/1/0428/4920/6439/files/causes_of_test_anxiety.pdf
    • https://cdn.shopify.com/s/files/1/0433/5281/7832/files/wordly_wise_3000_book_6_lesson_4.pdf
    • https://cdn.shopify.com/s/files/1/0436/9884/7896/files/zexoraf.pdf
    • https://cdn.shopify.com/s/files/1/0431/3376/3746/files/28019485340.pdf
    • https://cdn.shopify.com/s/files/1/0432/3049/4878/files/43408388699.pdf
    • https://cdn.shopify.com/s/files/1/0433/3309/1496/files/tumakasezonefov.pdf
    • https://cdn.shopify.com/s/files/1/0438/8657/5771/files/31920565071.pdf
    • https://cdn.shopify.com/s/files/1/0437/0307/4971/files/chapter_12_psychology_quiz_answers.pdf
    • https://cdn.shopify.com/s/files/1/0431/7852/4831/files/gibafin.pdf
    • https://cdn.shopify.com/s/files/1/0432/1404/5341/files/duvemerepozojulab.pdf
    • https://cdn.shopify.com/s/files/1/0432/2993/7832/files/rumav.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_off00005fea.bin
c2f61ea9ea9ffdd778406a51d249e10546860c01e02837749f6e1ebe40231b07
pdf-font-stream PDF embedded font (sfnt) at offset 0x5FEA 5408 bytes
font_01_sfnt_off0000724e.bin
f9457b1960d3f82a4d87877aa814d9dd6de2386de9ad0c67ff343cc2656b552a
pdf-font-stream PDF embedded font (sfnt) at offset 0x724E 9880 bytes