Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9c08615943e9f97…

MALICIOUS

PDF

42.9 KB Created: 2020-08-16 00:27:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fa61daf97d0ebd99a76b6fdc932f647c SHA-1: ebcec9f4c71ee500ec5c83215dd18ca403b2a9a2 SHA-256: b9c08615943e9f97efde96f954051151883baa256a483b89d8821b34f84c9fa6
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many pointing to Shopify domains, but also includes a critical redirector link to 'ttraff.cc'. This suggests a link farm or SEO poisoning tactic designed to drive traffic to malicious infrastructure. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains references to the redirector URL and other PDF files, reinforcing the lure.

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/wb?keyword=forge%20world%208th%20edition%20pdf
    • http://files.kmajda.net/uploads/1/3/1/6/131606331/rofetamiwekokove.pdf
    • http://files.closeandpaschalauction.com/uploads/1/3/1/3/131383283/9528199.pdf
    • https://cdn.shopify.com/s/files/1/0431/4945/9605/files/zojixuritaxot.pdf
    • https://cdn.shopify.com/s/files/1/0431/1416/8480/files/55551947298.pdf
    • https://cdn.shopify.com/s/files/1/0431/4936/1314/files/71404541620.pdf
    • https://cdn.shopify.com/s/files/1/0435/4444/5092/files/88946825235.pdf
    • https://cdn.shopify.com/s/files/1/0432/1381/5966/files/12559133435.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/87678197609.pdf
    • https://cdn.shopify.com/s/files/1/0434/0360/8216/files/sefabafupesumurat.pdf
    • https://cdn.shopify.com/s/files/1/0431/0381/3781/files/pikiretolavo.pdf
    • https://cdn.shopify.com/s/files/1/0440/6090/1528/files/92831018405.pdf
    • https://cdn.shopify.com/s/files/1/0435/3903/8359/files/absorcion_atomica_de_llama.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_off000061c5.bin
f9c02f688b38a81149b1148d1d6b50463ebe0c7ca188f9ea5dbb455841f48888
pdf-font-stream PDF embedded font (sfnt) at offset 0x61C5 5156 bytes
font_01_sfnt_off00007360.bin
a36eee06fef6ce219692c4ec918276ac99413e4fd1e3666e4031624f9289d620
pdf-font-stream PDF embedded font (sfnt) at offset 0x7360 1800 bytes
font_02_sfnt_off00007bed.bin
339e1e2db2c88bfd1af99f949d73cd5f49a5b47916c35c1b6665f3bfbb40c7a8
pdf-font-stream PDF embedded font (sfnt) at offset 0x7BED 10136 bytes