Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb72b2a6f9cedb19…

MALICIOUS

PDF

62.7 KB Created: 2020-08-29 20:05:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d5541a8e11609cc760341a6ec9244f2a SHA-1: 74122b8a009d7cc6bf0cf383e6716aa10f3a9495 SHA-256: bb72b2a6f9cedb19db8fb5ec4fcc896928e557c3da63ef95f8d0f629f41ce1f5
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.com/wix?keyword=army+convoy+deliberate+risk+assessment+example'. The document body, though heavily obfuscated, contains this URL, suggesting the primary intent is to redirect the user to malicious infrastructure. The ML classifier also 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/wix?keyword=army+convoy+deliberate+risk+assessment+example
    • https://cdn.shopify.com/s/files/1/0432/2908/5859/files/fallout_shelter_achievement_guide_and_roadmap.pdf
    • https://cdn.shopify.com/s/files/1/0432/5064/7204/files/fangirl_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/3694/2234/files/42913445760.pdf
    • https://static.usrfiles.com/ugd/b8c837_126fc4e8036b4a018433c4911e9352bf.pdf
    • https://static.usrfiles.com/ugd/39cb9d_cdb410d8bcc44e5eb492e4c58c8fa565.pdf
    • https://static.usrfiles.com/ugd/b8c837_da1b8b8407d442d7998881b1a0444216.pdf
    • https://static.usrfiles.com/ugd/b8c837_68a5d3c55f344a95a4998d1bb1290c7a.pdf
    • https://static.usrfiles.com/ugd/b8c837_0936679e5e8f45da934086d05a081a7a.pdf
    • https://static.usrfiles.com/ugd/b8c837_370d3142b2dd427b91091a4ecdfb54ec.pdf
    • https://static.usrfiles.com/ugd/136d07_e7542f6a891c431a9288de8cd829e7de.pdf
    • https://static.usrfiles.com/ugd/b8c837_1df06a60e2a0448bb8c8dd8cb523d366.pdf
    • https://static.usrfiles.com/ugd/238140_0debfd2dd8b1439db1c22b0491db26be.pdf
    • https://cdn.shopify.com/s/files/1/0433/8683/1004/files/najijunedorekaxi.pdf
    • https://cdn.shopify.com/s/files/1/0430/0596/8537/files/32611874790.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
stream_006_off0000d23c.bin
bce700e6dfb9f3096c20908a250301e48675f2bcf39069452dfb5eb330edfbdb
decompressed-pdf-stream PDF FlateDecoded stream at offset 0xD23C 17844 bytes
font_00_sfnt_off000092bd.bin
f075876a058e8e029c16640ae3006b2de5ddf9f7ae51cbec406fef87f586e9da
pdf-font-stream PDF embedded font (sfnt) at offset 0x92BD 5640 bytes
font_01_sfnt_off0000a5d3.bin
f03b423cc3727131e5e94383fc94097ccb9323ea4c44e1ba45a5ee0aec1bc1c2
pdf-font-stream PDF embedded font (sfnt) at offset 0xA5D3 14068 bytes