Malicious PDF — malware analysis report

Static analysis result for SHA-256 813b6f6faf22441a…

MALICIOUS

PDF

40.4 KB Created: 2020-08-07 07:43:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3067caffc5eeafcdf7818590745b2984 SHA-1: 7d5189a85c4807b46d59d2ff0aee6dd011f7e46f SHA-256: 813b6f6faf22441a522bceffe78323e771c513b1caa166fecdaaaed6c80cb1e8
152 Risk Score

Malware Insights

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

The PDF was flagged by a critical heuristic for linking to known malicious redirector infrastructure, specifically 'ttraff.cc'. Additionally, it contains a mass external PDF link farm, with many links pointing to Shopify domains, suggesting an attempt to obscure the true malicious destination. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the sheer volume of embedded links points to a delivery mechanism for 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/pify?keyword=tamil+christian+calendar+2020+pdf
    • http://files.olgarocklin.com/uploads/1/3/0/8/130873965/ripupinexowi.pdf
    • http://sitofijex.bignightconsulting.com/uploads/1/3/0/7/130738970/800cbb2e25d6121.pdf
    • http://files.priscilladisla.com/uploads/1/3/0/7/130775137/6272198.pdf
    • http://files.servicethatsreliable.com/uploads/1/3/1/6/131637953/samexi.pdf
    • http://files.onyxfuneralplanning.com/uploads/1/3/1/3/131380413/pofadajigivep.pdf
    • https://cdn.shopify.com/s/files/1/0431/2432/6564/files/58633215843.pdf
    • https://cdn.shopify.com/s/files/1/0434/1334/0312/files/22362867815.pdf
    • https://cdn.shopify.com/s/files/1/0440/8747/6389/files/miberupoxutoruzaz.pdf
    • https://cdn.shopify.com/s/files/1/0438/5210/3842/files/vobenika.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/1741436775.pdf
    • https://cdn.shopify.com/s/files/1/0428/2135/3635/files/29041952791.pdf
    • https://cdn.shopify.com/s/files/1/0431/4100/5480/files/koseluxaxama.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/46150969179.pdf
    • https://cdn.shopify.com/s/files/1/0437/1959/0056/files/24097586392.pdf
    • https://cdn.shopify.com/s/files/1/0432/8646/2628/files/tikisuxaxojimip.pdf
    • https://cdn.shopify.com/s/files/1/0437/8004/7010/files/noravukanofe.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_off00005fdb.bin
c5f0cba1160cd900ebf657494cf34bddf103c291f3627acd202c1feed95413ba
pdf-font-stream PDF embedded font (sfnt) at offset 0x5FDB 5620 bytes
font_01_sfnt_off000072c2.bin
d613aae11d0ec1cf84f11aa9840c92d8970816e7c36dc066ebe001010caa51e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x72C2 9864 bytes