Malicious PDF — malware analysis report

Static analysis result for SHA-256 26a92e17e62fa2ea…

MALICIOUS

PDF

39.3 KB Created: 2020-09-01 14:15:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e456d92d6eb006dc313549598f565fdf SHA-1: 912c6cc70939dfe0bae36ee98f1fd8fe35b83401 SHA-256: 26a92e17e62fa2eacf9f98bf71930c9a55b6f5ef0b35d89ac826a1d18f134322
154 Risk Score

Malware Insights

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

The PDF file contains a link to a known malicious redirector, ttraff.com, which is disguised as a definition of asymmetric warfare. This suggests a social engineering tactic to lure users to a malicious site. The file also contains a large number of embedded links, many pointing to PDF files on static.usrfiles.com, indicating a potential link farm or SEO poisoning attempt to improve search engine ranking for malicious content. No scripts were extracted, but the primary malicious activity appears to be redirection to a harmful URL.

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=asymmetric+warfare+definition+pdf
    • https://static.usrfiles.com/ugd/735189_e3adc656308443ff8b96fe77d2338a6e.pdf
    • https://static.usrfiles.com/ugd/834936_d2692a7626194ba3a6a59a9cbb3a2c04.pdf
    • https://static.usrfiles.com/ugd/66c878_91f91285922b43d6ac8771924887ea0f.pdf
    • https://static.usrfiles.com/ugd/fd30ac_25167d364e0e4cce924b59e24fda633c.pdf
    • https://static.usrfiles.com/ugd/0aab01_b68678e6bb7944708c5f9b815a94eb11.pdf
    • https://cdn.shopify.com/s/files/1/0434/7713/9613/files/f_to_c_conversion_chart.pdf
    • https://cdn.shopify.com/s/files/1/0429/6769/5509/files/3590840061.pdf
    • https://cdn.shopify.com/s/files/1/0429/6137/1290/files/gamazenerovisexa.pdf
    • https://cdn.shopify.com/s/files/1/0447/3903/5290/files/pet_insurance_nationwide_claim_form.pdf
    • https://cdn.shopify.com/s/files/1/0437/9577/5650/files/best_ebook_reader_for_scanneds.pdf
    • https://cdn.shopify.com/s/files/1/0441/0572/8152/files/xebofopagulemewujanelo.pdf
    • https://cdn.shopify.com/s/files/1/0434/7386/2808/files/43733081911.pdf
    • https://static.usrfiles.com/ugd/b8c837_75560a67bc894a448044a18ddd58077f.pdf
    • https://static.usrfiles.com/ugd/6cf804_5f6defbd5be448e0be086402c262b830.pdf
    • https://static.usrfiles.com/ugd/868401_3ac3431470894388adcc02aff7a6938b.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_off00005d8f.bin
8abad42aff9b621cc7559fc99d35f26fad268a35a8d32e4f5b5683376f35760c
pdf-font-stream PDF embedded font (sfnt) at offset 0x5D8F 5452 bytes
font_01_sfnt_off0000701d.bin
0b3520242cb52f8b25886a12c5fbd12ee8b54d40dbd34a1a466e9c767b44b26c
pdf-font-stream PDF embedded font (sfnt) at offset 0x701D 9472 bytes