Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed6ef8d749915d7b…

MALICIOUS

PDF

32.6 KB Created: 2020-08-30 20:25:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 32725a5b8eb6a4682cb7e8332c09d347 SHA-1: 4db66df64e12c7638392d05a9c6f620fc548cf21 SHA-256: ed6ef8d749915d7b933271e1880c4bde3339d06cfbcbf5fdbaf9982143bf256a
152 Risk Score

Malware Insights

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

The PDF contains a link that redirects to a known malicious domain, disguised with a plausible lure related to 'army vehicle dispatch request form'. The ML classifier strongly indicated maliciousness, and the PDF structure itself contains multiple external links, suggesting a link farm or redirection attempt. No scripts were extracted, but the primary malicious action is the embedded malicious URL.

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.ru/wix?keyword=army+vehicle+dispatch+request+form
    • https://static.usrfiles.com/ugd/105a8c_e0c009e4d6284014ad099f5a5eb1eff6.pdf
    • https://static.usrfiles.com/ugd/b8c837_bdc2cf9ebb4d4a149e0e175c238cc992.pdf
    • https://static.usrfiles.com/ugd/b8c837_8a1106e07fa74690aa14897735df7630.pdf
    • https://cdn.shopify.com/s/files/1/0437/6163/1384/files/debrief_template_word.pdf
    • https://cdn.shopify.com/s/files/1/0432/9776/7592/files/vedomopofopomej.pdf
    • https://cdn.shopify.com/s/files/1/0432/5824/9376/files/zebuvoperuxiji.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/53059057271.pdf
    • https://cdn.shopify.com/s/files/1/0429/1294/0188/files/11455100603.pdf
    • https://static.usrfiles.com/ugd/b7ab08_832b062aae40421ba4aab308fe0cf5c8.pdf
    • https://static.usrfiles.com/ugd/b8c837_e0c3c45da79249788ec0ee31b601bc21.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_off0000417d.bin
f69dd59208bb0bbb2f35624a2a30b748f98c38cfdea06fabc7223c1025456ade		 pdf-font-stream PDF embedded font (sfnt) at offset 0x417D 5672 bytes
font_01_sfnt_off000054a6.bin
e19c5e5ff58b199a629617acba4693e42fa8957bca80c692c304de94cd9a3328		 pdf-font-stream PDF embedded font (sfnt) at offset 0x54A6 9864 bytes

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