Malicious PDF — malware analysis report

Static analysis result for SHA-256 82c31357f940789c…

MALICIOUS

PDF

38.3 KB Created: 2020-09-02 23:51:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f593fedd11db324b7aebd0adc0c09171 SHA-1: 59134308b156ed38ec4b13e8ce3be5d3df7bfef5 SHA-256: 82c31357f940789cce7d304ab7da9085654b98c1f79fb6e1fde73ec6185ec4ca
152 Risk Score

Malware Insights

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

The PDF contains a prominent link to a known malicious redirector, ttraff.me, disguised as a confidentiality agreement template. This indicates a phishing attempt to redirect users to malicious infrastructure. The PDF also contains a large number of links to other PDFs hosted on Shopify and usrfiles.com, suggesting a link farm or SEO poisoning tactic to improve search engine ranking 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.me/wix?keyword=confidentiality+agreement+sample+template
    • https://cdn.shopify.com/s/files/1/0434/2035/2677/files/kefurezedu.pdf
    • https://cdn.shopify.com/s/files/1/0440/6371/9574/files/echo_srm_225_manual.pdf
    • https://cdn.shopify.com/s/files/1/0429/7038/2485/files/sodium_hydroxide_and_hydrochloric_acid_lab_report.pdf
    • https://cdn.shopify.com/s/files/1/0463/2595/6765/files/the_age_of_adaline_movie_300mb.pdf
    • https://cdn.shopify.com/s/files/1/0463/0491/9714/files/25039920410.pdf
    • https://cdn.shopify.com/s/files/1/0429/3728/6812/files/51793293310.pdf
    • https://static.usrfiles.com/ugd/2f8cea_542e43f58be644df89b8b4406c95a0fc.pdf
    • https://static.usrfiles.com/ugd/b8c837_861f8523df4c4ac38abca19799ba8965.pdf
    • https://static.usrfiles.com/ugd/0511f5_bd61af686c3a4d6d9600ea03014cf19f.pdf
    • https://static.usrfiles.com/ugd/e2b09b_a45d2f7893614ca8a04b3f21d09dd138.pdf
    • https://static.usrfiles.com/ugd/739437_a77d8c54419944c79e29650181f61352.pdf
    • https://static.usrfiles.com/ugd/5d2cf3_29ae22d6bfd64c4fbb9b73f479e890e4.pdf
    • https://static.usrfiles.com/ugd/b8c837_f8247b8008014c66982ddd0acc608df6.pdf
    • https://static.usrfiles.com/ugd/7d1dc9_219079ff5f914dde8fd81da1faf36333.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_off00005a42.bin
de054c5068d314cea5c96ddb6153dc51220b9309481d5131e972cff989891d0f
pdf-font-stream PDF embedded font (sfnt) at offset 0x5A42 5368 bytes
font_01_sfnt_off00006c7c.bin
ce742f93a67833efc3811205ac7c1415558cdf0c16f55da4dc6f095dd496a50a
pdf-font-stream PDF embedded font (sfnt) at offset 0x6C7C 9408 bytes