Malicious PDF — malware analysis report

Static analysis result for SHA-256 40ef526fb252b0a3…

MALICIOUS

PDF

36.3 KB Created: 2020-09-01 01:44:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f45d6caa4bebd8a564e23d334ec3c580 SHA-1: c22f1c6fe2faff3b7fbdbdc54b6a523892d9bc74 SHA-256: 40ef526fb252b0a397f27fab071125859f9513eaac81e6004f86ca374c6931d2
152 Risk Score

Malware Insights

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

The PDF was flagged by multiple critical heuristics for containing malicious redirector links and a link farm. The primary malicious URL identified is ttraff.ru, which is known to host redirectors. While many other URLs point to benign Shopify domains, the presence of the malicious redirector indicates a clear intent to lead users to harmful content. No scripts were extracted, and the document body was heavily obfuscated.

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.ru/wix?keyword=prima+della+corned+beef+nutritional+information
    • https://cdn.shopify.com/s/files/1/0437/2827/3562/files/punctuation_practice_exercises.pdf
    • https://cdn.shopify.com/s/files/1/0445/6172/7647/files/what_is_the_date_format_in_mexico.pdf
    • https://cdn.shopify.com/s/files/1/0461/9013/3406/files/aplastic_anemia_review_of_etiology_and_treatment.pdf
    • https://cdn.shopify.com/s/files/1/0435/4693/5445/files/soruzavuvexizipituwoxa.pdf
    • https://cdn.shopify.com/s/files/1/0430/7740/2778/files/77857800793.pdf
    • https://static.usrfiles.com/ugd/111c46_27b620d78bba402f90ea181cff8953d4.pdf
    • https://static.usrfiles.com/ugd/b8c837_35c50be2dfed4c58b285b38b45f37d2c.pdf
    • https://static.usrfiles.com/ugd/3be3a7_6355998cd552496da92d30c6a7ac0f59.pdf
    • https://static.usrfiles.com/ugd/b8c837_6a08c401915e4bd18991ef63afac1668.pdf
    • https://static.usrfiles.com/ugd/4f270c_88c1c57b37b64c24b6af7e4259cbb1d5.pdf
    • https://static.usrfiles.com/ugd/a382ee_c3e29fb78f6e4b24b0e1140e18292524.pdf
    • https://static.usrfiles.com/ugd/a4e402_7472eccaf089411a978284bb9977765e.pdf
    • https://static.usrfiles.com/ugd/b8c837_82510f476aff418780b6dab1ffc9593e.pdf
    • https://static.usrfiles.com/ugd/b8c837_04cff1fba101469d8086848e1e7b3807.pdf
    • https://static.usrfiles.com/ugd/e3325f_3ff9afbb5aad47d2ae19b8dbe08c362e.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_off00004f3e.bin
fe3df999fb06641b48d0f24bcc62bf86a1438276355c0ab2d0f2a6e4538c2203
pdf-font-stream PDF embedded font (sfnt) at offset 0x4F3E 5132 bytes
font_01_sfnt_off00006095.bin
443ab2c4119136e6e62b9d8bfcf29baea2d52faf6389a10e415ec612e9ae997b
pdf-font-stream PDF embedded font (sfnt) at offset 0x6095 10428 bytes