Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4ea9057ccd8c8fa…

MALICIOUS

PDF

43.7 KB Created: 2020-08-31 07:42:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 36232ec861bdc09561604b8aa6d15e2e SHA-1: 3d745870d29d18071df27bb08a4793731c925cbc SHA-256: c4ea9057ccd8c8fab7f4c70ad62bb0d5717a4380296219f1080519ed5afc9a87
152 Risk Score

Malware Insights

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

The PDF file contains a link farm, with multiple links pointing to Shopify-hosted PDFs. One of these links, 'https://ttraff.cc/wix?keyword=slavia+618+air+rifle+parts', is identified as a malicious redirector. This suggests the document is designed to lure users to malicious infrastructure, likely for further exploitation or phishing.

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/wix?keyword=slavia+618+air+rifle+parts
    • https://cdn.shopify.com/s/files/1/0430/4207/8877/files/74140729269.pdf
    • https://cdn.shopify.com/s/files/1/0434/0586/9217/files/34951417080.pdf
    • https://cdn.shopify.com/s/files/1/0429/9436/8663/files/4147900587.pdf
    • https://cdn.shopify.com/s/files/1/0436/9442/4232/files/jufuzedig.pdf
    • https://cdn.shopify.com/s/files/1/0431/6548/3172/files/55701825905.pdf
    • https://cdn.shopify.com/s/files/1/0428/2567/9015/files/16772598676.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kemulubu.pdf
    • https://cdn.shopify.com/s/files/1/0450/4174/6078/files/interpretation_of_cardiac_enzymes.pdf
    • https://cdn.shopify.com/s/files/1/0435/8511/0175/files/vefifuv.pdf
    • https://static.usrfiles.com/ugd/9ff9b8_6182c0c1f4ab435292946387a603622a.pdf
    • https://static.usrfiles.com/ugd/a91264_84b832a34ce747af8ff3e94c71eb1a30.pdf
    • https://static.usrfiles.com/ugd/f80014_2fd4b2900088446cbc616a704968ffa6.pdf
    • https://static.usrfiles.com/ugd/dc8a8e_62a2d613154e415f9eec530e0c5b6bfc.pdf
    • https://static.usrfiles.com/ugd/6f58fb_2cd9cc175dfe423d8b06e614a1822f33.pdf
    • https://static.usrfiles.com/ugd/b8c837_5c3a3acd1f15404a9c940703016500d1.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_off00006c61.bin
ce657710dba18bfa5182a59da08f19075c8ee2aa451e30be9a340235e29c69cd
pdf-font-stream PDF embedded font (sfnt) at offset 0x6C61 5460 bytes
font_01_sfnt_off00007efe.bin
311d1ec25b2fbbe0578f293e42c21fc2eb36fd2dbb14b4eec7a7fcb68c4084a3
pdf-font-stream PDF embedded font (sfnt) at offset 0x7EFE 10200 bytes