Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7785677a47591f8…

MALICIOUS

PDF

39.8 KB Created: 2020-08-18 23:49:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c5b7e1d234fe4ff5e33719f160f242f8 SHA-1: aee07d9c1a2cfcca20d7ace7ea2d5160ecec5a0a SHA-256: e7785677a47591f8739aa645d3902e9fde32dd21c925017420fd3fcab0d49192
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 pointing to Shopify domains, but one critical link directs to a known malicious redirector at `ttraff.ru`. This suggests a link farm or redirection tactic to obscure the ultimate malicious destination. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, and the document body is heavily obfuscated, but the presence of the malicious redirector is the primary indicator of compromise.

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/pify?keyword=apogee+jam+96+manual
    • http://pazebi.mancostrails.org/uploads/1/3/1/4/131406455/gawozuvet.pdf
    • https://cdn.shopify.com/s/files/1/0428/2328/6951/files/dinamani_today_news.pdf
    • https://cdn.shopify.com/s/files/1/0431/5286/7494/files/36534484798.pdf
    • https://cdn.shopify.com/s/files/1/0433/4691/9579/files/51565339507.pdf
    • https://cdn.shopify.com/s/files/1/0430/8172/8151/files/analyzing_financial_statements_8th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/51851907441.pdf
    • https://cdn.shopify.com/s/files/1/0431/2026/3322/files/lonav.pdf
    • https://cdn.shopify.com/s/files/1/0427/9474/6023/files/95272329394.pdf
    • https://cdn.shopify.com/s/files/1/0431/6217/3602/files/serego.pdf
    • https://cdn.shopify.com/s/files/1/0440/9550/4536/files/53464686786.pdf
    • https://cdn.shopify.com/s/files/1/0434/2389/1618/files/kikaxe.pdf
    • https://cdn.shopify.com/s/files/1/0437/4082/3706/files/godosewodawu.pdf
    • https://cdn.shopify.com/s/files/1/0433/2378/5370/files/matelofujodazigif.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_off00005e5f.bin
4b23c248fa3c3154eaee3cfdfb9d7c7c82ce7e4f4906ef7a6fd44c1a3b7d82b7
pdf-font-stream PDF embedded font (sfnt) at offset 0x5E5F 5240 bytes
font_01_sfnt_off0000702a.bin
535f7c53877397746ffb585df429ff045db2f613d2530e8c0a677b866d98d303
pdf-font-stream PDF embedded font (sfnt) at offset 0x702A 10184 bytes