Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9632e23a17c2ffc…

MALICIOUS

PDF

40.3 KB Created: 2020-08-30 21:49:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eec8d2f5eabd9c119851741f611891fe SHA-1: aaed7c59e9c1803aaf72251f2b026f22a12b19d3 SHA-256: a9632e23a17c2ffcec54b944de5c438e118e930622d3ecb23896bf39ce1207cf
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 of which point to Shopify domains, but one critical link directs to a known malicious redirector. The ML classifier strongly indicates maliciousness. The document body contains text that appears to be part of an SEO link farm strategy, aiming to attract users through search engines and then redirect them to 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.cc/wix?keyword=carlos+elpidio+hernandez+grajales+la
    • https://cdn.shopify.com/s/files/1/0433/4492/0734/files/des_algorithm_in_cryptography.pdf
    • https://cdn.shopify.com/s/files/1/0431/4873/8720/files/56174760190.pdf
    • https://cdn.shopify.com/s/files/1/0433/3889/1419/files/gomejusakibawani.pdf
    • https://cdn.shopify.com/s/files/1/0437/7152/7319/files/acer_aspire_one_d257_manual.pdf
    • https://cdn.shopify.com/s/files/1/0446/6225/9865/files/nedoruxariboturikomoxo.pdf
    • https://cdn.shopify.com/s/files/1/0440/0293/4942/files/speed_and_upload_speed_test.pdf
    • https://cdn.shopify.com/s/files/1/0436/0008/5160/files/candida_albicans_bucal.pdf
    • https://cdn.shopify.com/s/files/1/0437/1460/9303/files/62978287586.pdf
    • https://cdn.shopify.com/s/files/1/0429/2260/6759/files/12040322439.pdf
    • https://cdn.shopify.com/s/files/1/0434/3152/6557/files/ccna_security_2020.pdf
    • https://cdn.shopify.com/s/files/1/0439/5152/1947/files/29914616403.pdf
    • https://static.usrfiles.com/ugd/0cd3a8_2b1c4a35b1ed4e8383d047b6907a89ef.pdf
    • https://static.usrfiles.com/ugd/b8c837_9a1e20dd27f2416ea1efae8364f4157a.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_off00006074.bin
ffdc944ea6a4afa5175aa404cbd4837b42ea0409f4d2b59530e0851f2fd4e1c4
pdf-font-stream PDF embedded font (sfnt) at offset 0x6074 5252 bytes
font_01_sfnt_off00007250.bin
24215de897b52abaf596205a9df0d5a8659f176739da55ef4f10792a24ba4629
pdf-font-stream PDF embedded font (sfnt) at offset 0x7250 10040 bytes