Malicious PDF — malware analysis report

Static analysis result for SHA-256 d394442c4b0e2b67…

MALICIOUS

PDF

48.9 KB Created: 2020-07-31 07:46:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 29092353cfdcb8a4c89f545391f0df3e SHA-1: b745df3c9372bf0f7f7cf48f3fe1621f1ea82774 SHA-256: d394442c4b0e2b6775a5c4ecc87c087daaf601fa1fba20ed84bc355c6a920fa2
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing for a malicious redirector at 'https://ttraff.com/pify?keyword=shunt+excited+dc+motor+pdf'. Another critical heuristic indicates a PDF link farm, with many links pointing to shopify.com domains, suggesting an attempt to manipulate search engine results or distribute malicious content. The ML classifier strongly flagged this PDF as malicious.

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=shunt+excited+dc+motor+pdf
    • http://files.ulstl.com/uploads/1/3/1/1/131164081/xelibarevedomuw.pdf
    • http://files.stjohnsbjj.ca/uploads/1/3/1/4/131452903/88c3b27fac5f7.pdf
    • http://files.adonistaon.com/uploads/1/3/2/6/132682882/f86e9d6d0a061f.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/laxefasigapabaxirasu.pdf
    • https://cdn.shopify.com/s/files/1/0431/7632/9373/files/25422268278.pdf
    • https://cdn.shopify.com/s/files/1/0431/9592/4640/files/riwimadumafaxe.pdf
    • https://cdn.shopify.com/s/files/1/0433/8103/1064/files/zexedut.pdf
    • https://cdn.shopify.com/s/files/1/0430/2739/8807/files/5073820189.pdf
    • https://cdn.shopify.com/s/files/1/0427/8370/3206/files/21937885364.pdf
    • https://cdn.shopify.com/s/files/1/0438/3506/4480/files/53813497287.pdf
    • https://cdn.shopify.com/s/files/1/0434/7304/3622/files/simubejenuwinelaromuzanap.pdf
    • https://cdn.shopify.com/s/files/1/0429/6704/0154/files/97378239893.pdf
    • https://cdn.shopify.com/s/files/1/0437/7808/0919/files/lonibikupokupewizebulafo.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/
    • https://cdn.shopify.com/s/f

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006e7b.bin
1a07440e07a0229ca2f1a8ce2b042ec47082c0d81f6c12e97ece8189fc6fd024
pdf-font-stream PDF embedded font (sfnt) at offset 0x6E7B 5028 bytes
font_01_sfnt_off00007f63.bin
7284fbac4dd5fc6f0b219c68d8ff07458e93b6c9d7748b7aa73e8a4d8ac7b661
pdf-font-stream PDF embedded font (sfnt) at offset 0x7F63 9888 bytes
font_02_sfnt_off0000a168.bin
f7c959ef3840947929b2fbf21a6f844c3d2ba9157ff04f9c13ff486e75cc34e4
pdf-font-stream PDF embedded font (sfnt) at offset 0xA168 16192 bytes