Malicious PDF — malware analysis report

Static analysis result for SHA-256 aaaaf943f29eee53…

MALICIOUS

PDF

81.9 KB Created: 2020-08-30 11:21:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 276eeca18e60a9b5a7d133f728a09b58 SHA-1: e594db7fe5491511d48b5fe13efa24a4e147144a SHA-256: aaaaf943f29eee53ac5e729dc7c44bbabab155ae53aa023869403459cf7163eb
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.com'. The document body, though heavily obfuscated, also contains this URL. The ML classifier strongly indicates maliciousness. The PDF also exhibits characteristics of a link farm, with numerous embedded URLs, many pointing to Shopify, likely to obscure the malicious redirector.

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=yajur+veda+sandhyavandanam+in+tamil+language
    • https://cdn.shopify.com/s/files/1/0435/3795/7023/files/elementary_row_operations_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0428/2040/3356/files/foxuteguzagalodelunil.pdf
    • https://cdn.shopify.com/s/files/1/0431/0876/1751/files/7629367907.pdf
    • https://static.usrfiles.com/ugd/e8506d_0c2c8a15684249ccaa8aeb395e4b9b8c.pdf
    • https://cdn.shopify.com/s/files/1/0433/0238/7867/files/army_new_uniform_acu.pdf
    • https://cdn.shopify.com/s/files/1/0427/9212/4572/files/cinema_4d_r20_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0431/9110/7752/files/pegusotasozomobutazu.pdf
    • https://cdn.shopify.com/s/files/1/0428/6038/0327/files/sifat_shalat_nabi_yazid_bin_abdul_qadir_jawas.pdf
    • https://cdn.shopify.com/s/files/1/0431/5453/8656/files/ableton_live_10_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0438/4079/8885/files/que_es_psicologia_infantil.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9be.bin
9403b3a7f8ca2e674acc6a409d6b7eef89d64d9d50f7cac67aef8e6911bc6312
pdf-font-stream PDF embedded font (sfnt) at offset 0xE9BE 5436 bytes
font_01_sfnt_off0000fc22.bin
2020aed4108ad8e2b79a55c077a4562926b23a6bb8e14e62fac6bef4914548ae
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC22 16016 bytes
font_02_sfnt_off00012d81.bin
e97008b4f1b32f90c4d457f1a6fb2074aa595a4bf6c2b6132e836057d048c9c0
pdf-font-stream PDF embedded font (sfnt) at offset 0x12D81 3196 bytes