Malicious PDF — malware analysis report

Static analysis result for SHA-256 a13bdfe565f98648…

MALICIOUS

PDF

45.4 KB Created: 2020-08-30 14:54:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 143b52c6569b057d24b5fc1399fb6df4 SHA-1: 6c8f9fdfbfaad6b2c0a1c49cd81c5f2a26fb925a SHA-256: a13bdfe565f98648c2200381b85d8f922d53a44fc24140e3744a78ad135494a1
152 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which, https://ttraff.ru/wix?keyword=lean+body+hacks+pdf, is flagged as a malicious redirector. The document body, though heavily obfuscated, also contains this URL, suggesting an attempt to direct users to malicious content under the guise of 'lean body hacks'. The presence of numerous other links to Shopify, while benign, contributes to the link farm heuristic, indicating a potential SEO poisoning or traffic generation scheme.

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=lean+body+hacks+pdf
    • https://cdn.shopify.com/s/files/1/0436/7784/3609/files/best_free_template_for_wordpress.pdf
    • https://cdn.shopify.com/s/files/1/0431/7121/7565/files/empire_s2_e4.pdf
    • https://cdn.shopify.com/s/files/1/0428/3619/7542/files/lojik.pdf
    • https://cdn.shopify.com/s/files/1/0432/0978/5512/files/11202907351.pdf
    • https://cdn.shopify.com/s/files/1/0433/3050/2806/files/gitikevutoxudivuxanevej.pdf
    • https://cdn.shopify.com/s/files/1/0437/6359/7466/files/27392454485.pdf
    • https://cdn.shopify.com/s/files/1/0433/9243/4339/files/first_10_amendments.pdf
    • https://cdn.shopify.com/s/files/1/0431/1829/7245/files/bulode.pdf
    • https://cdn.shopify.com/s/files/1/0436/5297/2697/files/xigufozopelez.pdf
    • https://cdn.shopify.com/s/files/1/0431/3595/9191/files/ducati_998_workshop_manual.pdf
    • https://static.usrfiles.com/ugd/88a84f_2610cb14dc35456881a94982098c88ac.pdf
    • https://static.usrfiles.com/ugd/b8c837_7337b047cace4f24a068a8c5ea9ac969.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_off00007410.bin
32fbfa74a079b28a33047ba82907663ee0f354da22636260a35cbf8b1ce97297
pdf-font-stream PDF embedded font (sfnt) at offset 0x7410 5364 bytes
font_01_sfnt_off0000864f.bin
38a1e6158cb93ca1dc04da5a855f90a40c5f1aadf71181b5e7057754e3448158
pdf-font-stream PDF embedded font (sfnt) at offset 0x864F 10208 bytes