Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cb687d345b85f3c…

MALICIOUS

PDF

41.8 KB Created: 2020-08-31 15:47:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d2bdd65ad8ca0a09be4c3f158f2bcaf4 SHA-1: 5a0e548b198537a67b693b411da4a5dee19d10af SHA-256: 1cb687d345b85f3cdec1edc92e96b4b8a21d72f98bae50f4518ac8bb5096a6b6
152 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by an ML classifier and contains a critical heuristic indicating a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the URL https://ttraff.me/wix?keyword=aqw+enhancements+class+guide, which is also listed as an embedded URL. The presence of a link farm suggests an attempt to manipulate search engine results or distribute content through multiple avenues.

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.me/wix?keyword=aqw+enhancements+class+guide
    • https://static.usrfiles.com/ugd/b8c837_8c5064a05d2f46b4ac596c50e7c9ba93.pdf
    • https://static.usrfiles.com/ugd/0a0016_66802fca619747db99dc676234ba958c.pdf
    • https://static.usrfiles.com/ugd/b8c837_a30a53eedc7b4b90a672a8dec0910a51.pdf
    • https://static.usrfiles.com/ugd/0d089b_668ccf43336640e9950daa88ad262a2a.pdf
    • https://static.usrfiles.com/ugd/9ea91e_402714d6e14e4b999235ce25debf72a3.pdf
    • https://cdn.shopify.com/s/files/1/0431/8501/2900/files/the_art_of_travel_alain_de_botton_download.pdf
    • https://static.usrfiles.com/ugd/b8c837_870f38f1880f485db65ace1972aabca5.pdf
    • https://static.usrfiles.com/ugd/b8c837_babffb207e8143ed8cd33ab84d595b2a.pdf
    • https://cdn.shopify.com/s/files/1/0431/8094/9658/files/assurance_wireless_application_ny.pdf
    • https://cdn.shopify.com/s/files/1/0437/9246/6080/files/94922556213.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://static.usrfiles.com/ugd

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006577.bin
d9bb61aa1f5d628a3f58203a874f3224692e01775b09edd1636a36fa9ac3bd3b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6577 5464 bytes
font_01_sfnt_off000077f6.bin
b7d522e57093e45896cbee97c32bf2288ee5bb21d22175025674a86f51f6f578		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77F6 10128 bytes

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