Malicious PDF — malware analysis report

Static analysis result for SHA-256 95aa7534024c95b7…

MALICIOUS

PDF

41.2 KB Created: 2020-08-16 18:08:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0dc8743b5051bd5659b5dc7aeaef6282 SHA-1: 9b7db5c22a95099f4ab1b5e109e5187dd3cf53f5 SHA-256: 95aa7534024c95b7935bba394c09d451614107d96667ae71b333d4c8d3e8db22
152 Risk Score

Malware Insights

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

The PDF contains a prominent link to 'ttraff.cc', identified as a malicious redirector. The document body, though heavily obfuscated, contains text suggesting it is related to 'ics 300 and 400 test answers', which serves as a lure. The presence of a large number of external PDF links, many hosted on Shopify, suggests a link farm designed to improve SEO for malicious content. The ML classifier also strongly indicated maliciousness.

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/pify?keyword=ics+300+and+400+test+answers
    • http://debeko.sequoyahspo.org/uploads/1/3/1/6/131606339/fimewud_sagapuxulorope_zejivogela_nizemiruruxu.pdf
    • https://cdn.shopify.com/s/files/1/0435/7373/9675/files/74847369685.pdf
    • https://cdn.shopify.com/s/files/1/0434/7258/4861/files/objective_agronomy_thava_prakash.pdf
    • https://cdn.shopify.com/s/files/1/0444/4474/5894/files/electronics_projects_for_dummies_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0437/7211/7141/files/tiravew.pdf
    • https://cdn.shopify.com/s/files/1/0436/0486/9277/files/wanogabaduvawemowesul.pdf
    • https://cdn.shopify.com/s/files/1/0434/6000/1957/files/44848868506.pdf
    • https://cdn.shopify.com/s/files/1/0437/6920/0791/files/bijaxadotudenilavowopu.pdf
    • https://cdn.shopify.com/s/files/1/0427/8150/7740/files/livro_de_cabala.pdf
    • https://cdn.shopify.com/s/files/1/0431/0004/5465/files/nonewigud.pdf
    • https://cdn.shopify.com/s/files/1/0432/0513/2456/files/tukofufojolofakufijeki.pdf
    • https://cdn.shopify.com/s/files/1/0433/6045/2760/files/jejavidedubejikoz.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_off000060d4.bin
1e615c96470e4ef6452f278ed9ec53907ca4459026344bfc344bc165df023b55
pdf-font-stream PDF embedded font (sfnt) at offset 0x60D4 5324 bytes
font_01_sfnt_off00007302.bin
5876918aa85e62094afc294d0ea83607adf2505df69ec2af78966bb16d4c90db
pdf-font-stream PDF embedded font (sfnt) at offset 0x7302 11216 bytes