Malicious PDF — malware analysis report

Static analysis result for SHA-256 40badc9bf3b1f860…

MALICIOUS

PDF

38.4 KB Created: 2020-08-18 18:40:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 348e50fffc5d9d5adaa6b8ea33f0a649 SHA-1: 834a505a362ef2c0cd4189bb4385424a2f46639a SHA-256: 40badc9bf3b1f860eec11f687e310db2cf97b88507cae169c291439b13d48a7c
152 Risk Score

Malware Insights

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

The PDF contains a link to a redirector service, ttraff.com, which is flagged as malicious. This redirector is likely used to obscure the final destination of the malicious payload. The document body, though heavily obfuscated, contains text related to 'Android auto bluetooth dongle' and the malicious URL, suggesting a lure. The presence of numerous embedded links, many pointing to Shopify domains hosting PDF files, indicates a link farm strategy, likely for SEO poisoning or distributing further malicious content. No scripts were extracted from this sample.

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.com/pify?keyword=android+auto+bluetooth+dongle
    • http://files.chsboosters.net/uploads/1/3/0/9/130969241/82687f67de79af.pdf
    • https://cdn.shopify.com/s/files/1/0429/8106/4853/files/fobovij.pdf
    • https://cdn.shopify.com/s/files/1/0427/6515/6508/files/27158501227.pdf
    • https://cdn.shopify.com/s/files/1/0434/7786/0516/files/pibugeje.pdf
    • https://cdn.shopify.com/s/files/1/0434/1877/9815/files/15296546124.pdf
    • https://cdn.shopify.com/s/files/1/0438/4574/6838/files/zenipolewisuga.pdf
    • https://cdn.shopify.com/s/files/1/0441/0785/8072/files/59022544661.pdf
    • https://cdn.shopify.com/s/files/1/0431/4903/3627/files/wedozovazuvifoge.pdf
    • https://cdn.shopify.com/s/files/1/0431/7066/0508/files/kigox.pdf
    • https://cdn.shopify.com/s/files/1/0436/8557/6857/files/71542241204.pdf
    • https://cdn.shopify.com/s/files/1/0429/0733/6857/files/pirepu.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_off00005a0f.bin
17c1d26aa1cb5f09681f753208358475f60ca05042c3977f4e3ea665dcefce6b
pdf-font-stream PDF embedded font (sfnt) at offset 0x5A0F 5036 bytes
font_01_sfnt_off00006b21.bin
0a3016e9b6a2a2ecba8ccca0f050a3d10fa3f3a4117db83b9c55c291397bb99e
pdf-font-stream PDF embedded font (sfnt) at offset 0x6B21 9992 bytes