Malicious PDF — malware analysis report

Static analysis result for SHA-256 940c4bd46f693f3f…

MALICIOUS

PDF

42.7 KB Created: 2020-08-30 11:52:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ef5571558ac1a6aa2b0d35dc61164985 SHA-1: 70c3c6a02c472d64137321d67e89a2cecef6ca74 SHA-256: 940c4bd46f693f3f993e63612a28cceaffe677ea1972af275d57771efdc6e37f
152 Risk Score

Malware Insights

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

This PDF file contains numerous links, including one pointing to a known malicious redirector at ttraff.com. The document body, though partially corrupted, contains text related to 'Roku tv screen mirroring' and the malicious URL, suggesting a lure to a phishing or malware distribution site. The PDF was flagged by a critical heuristic for linking to malicious redirector infrastructure and by an ML classifier.

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=roku+tv+screen+mirroring
    • https://static.usrfiles.com/ugd/b8c837_33ace708e8524835b9e9b6d815723726.pdf
    • https://static.usrfiles.com/ugd/b8c837_c4da3ffdcee642888a3fc7f9e5522a66.pdf
    • https://static.usrfiles.com/ugd/b8c837_31facdb28ae3470c841cfb5e3d84d451.pdf
    • https://static.usrfiles.com/ugd/01bc73_356319c717d74eb59b97ea474259e5d5.pdf
    • https://static.usrfiles.com/ugd/93c935_2a5b13c13073438994412dfe60d3bffd.pdf
    • https://static.usrfiles.com/ugd/b8c837_d86637aaf80a4a9192bfc9526af3486e.pdf
    • https://static.usrfiles.com/ugd/b8c837_971f29d3ee174c45a3ab1ecd491cf847.pdf
    • https://static.usrfiles.com/ugd/9374a7_d7bf84622c4c48689e7f2ba987410f6d.pdf
    • https://static.usrfiles.com/ugd/77d535_1b6fb3414fc2449481bce9165d4cf10d.pdf
    • https://static.usrfiles.com/ugd/6d59ab_9e44d3d0505644d5ba9e109545253f69.pdf
    • https://static.usrfiles.com/ugd/6290de_aa557a9185794db7bb09dc8d49dac0f2.pdf
    • https://static.usrfiles.com/ugd/c83fdb_80283743e87c4d358fa81d31bca804be.pdf
    • https://static.usrfiles.com/ugd/52b593_765341aafce2401b980f64483c27c604.pdf
    • https://static.usrfiles.com/ugd/b8c837_559675a73b904d7ba612f4eb3e05f2b7.pdf
    • https://static.usrfiles.com/ugd/cdb50c_28213fd3b98d41f380b811dc90f968a3.pdf
    • https://static.usrfiles.com/ugd/269bb8_f30431cccc64439db54be21275a36058.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_off000069a8.bin
ee66243fb7599bf16a239ef3e52a4daf79d28afc0076033e6721a58cf37b1000
pdf-font-stream PDF embedded font (sfnt) at offset 0x69A8 5008 bytes
font_01_sfnt_off00007aaf.bin
c48a2a425482c0b4a8e203c0fecf8d6d5dca28b90dc718f2ce4aab170618da4f
pdf-font-stream PDF embedded font (sfnt) at offset 0x7AAF 10404 bytes