Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c3e525a74fe2866…

MALICIOUS

PDF

36.5 KB Created: 2020-08-31 17:14:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fd3406b754b7b723de829c549deef0ef SHA-1: a24a3a2c782a9fe77b10b1a16ed4804a10de6205 SHA-256: 9c3e525a74fe2866c00de58cfb75fd83ff2060cdb54343e4a3174e025d3884ea
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Phishing: Spearphishing Attachment T1059.001 Command and Scripting Interpreter: PowerShell

The PDF document contains a large number of embedded links, many of which point to benign Shopify domains, but one critical link directs to a known malicious redirector. The document body, though heavily obfuscated, contains the text 'Aopc search warrant forms' and the malicious URL, suggesting a lure to trick users into clicking the malicious link. The ML classifier strongly supports the malicious verdict.

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=aopc+search+warrant+forms
    • https://cdn.shopify.com/s/files/1/0431/5788/0996/files/appetizer_menu.pdf
    • https://cdn.shopify.com/s/files/1/0462/9463/0560/files/26279631220.pdf
    • https://cdn.shopify.com/s/files/1/0438/1815/6192/files/misijedipirogafevifa.pdf
    • https://cdn.shopify.com/s/files/1/0428/6893/2767/files/nakasotezadidal.pdf
    • https://static.usrfiles.com/ugd/b8c837_15e9eb2a86294556bd47030af114e33a.pdf
    • https://static.usrfiles.com/ugd/086daf_0eb2d77818a241108b92b2d2cb946090.pdf
    • https://static.usrfiles.com/ugd/f09a9d_90ef7adcd0c248c99a941d4072fdfad3.pdf
    • https://static.usrfiles.com/ugd/b8c837_37c0672c55984546a209a1b2c222cf94.pdf
    • https://static.usrfiles.com/ugd/b8c837_1089c6a8614948b79ff195f8fdd50e4e.pdf
    • https://static.usrfiles.com/ugd/77941b_536d7bea5fc44772ace6576c626fb839.pdf
    • https://static.usrfiles.com/ugd/1cfe37_1d52b777e4e946109028f3267db078c4.pdf
    • https://static.usrfiles.com/ugd/b8c837_1de87f838e7b449388f40ad979f462a4.pdf
    • https://static.usrfiles.com/ugd/2e16aa_6cebcf0aad864cdaa5a3675ea04dd9fc.pdf
    • https://static.usrfiles.com/ugd/b8c837_8f8ef4fdabd7440c9452d65214075379.pdf
    • https://static.usrfiles.com/ugd/b8c837_7766d10a3d1948df888cf8c94ca6f3d8.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_off00005062.bin
fe3019fa4fff6a13572c3c186172e900ad6b2f30b2eb89fc64d8c05c65f6448c
pdf-font-stream PDF embedded font (sfnt) at offset 0x5062 5304 bytes
font_01_sfnt_off0000625b.bin
d27460b7520e5bf7672dc961a660022e752e89d9d98242df121030528f9a334e
pdf-font-stream PDF embedded font (sfnt) at offset 0x625B 10404 bytes