Malicious PDF — malware analysis report

Static analysis result for SHA-256 9dcd2d91298e51e6…

MALICIOUS

PDF

40.8 KB Created: 2020-08-31 09:24:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1a194a41aaaef56439daa2ff8fb2ffca SHA-1: c526ca87a6248d387b8681450b8772814c10b841 SHA-256: 9dcd2d91298e51e683a4740a465368d02eba52d83a2242cd28b225fd3b7e6429
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one specifically pointing to known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. The document body appears to be garbled, but the presence of the URL suggests a lure to external content. No scripts were extracted from this sample.

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=subnautica+alien+containment+location
    • https://cdn.shopify.com/s/files/1/0430/7877/9029/files/mawuzazasexelatevodoza.pdf
    • https://cdn.shopify.com/s/files/1/0432/7079/9516/files/ielts_academic_word_list_with_definitions.pdf
    • https://cdn.shopify.com/s/files/1/0433/7880/2846/files/rugapesawixupuraku.pdf
    • https://cdn.shopify.com/s/files/1/0454/1834/8712/files/wubakurisakinifovuj.pdf
    • https://cdn.shopify.com/s/files/1/0430/8277/6727/files/72036068465.pdf
    • https://cdn.shopify.com/s/files/1/0431/7688/6431/files/jedenewasobuw.pdf
    • https://cdn.shopify.com/s/files/1/0433/9128/7461/files/50241946868.pdf
    • https://static.usrfiles.com/ugd/3dd68e_596d7631385241eaabc63b1d28f3e3a7.pdf
    • https://static.usrfiles.com/ugd/26481d_d690bff2828647c78d6a3b72a228483c.pdf
    • https://static.usrfiles.com/ugd/b8c837_728224f793304c6e8f4557443b93638c.pdf
    • https://static.usrfiles.com/ugd/cc15ef_46160cac9c2545dd9f6c66fb505af63d.pdf
    • https://cdn.shopify.com/s/files/1/0427/6705/7063/files/19900027023.pdf
    • https://cdn.shopify.com/s/files/1/0441/2211/2152/files/binodini_rai_song_ringtone.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_off000063a8.bin
9ac4937aba11f3fde74fb3a164f643e0da5d396bfe7d12c6c6b8cd0eb86b6a78
pdf-font-stream PDF embedded font (sfnt) at offset 0x63A8 4912 bytes
font_01_sfnt_off00007444.bin
3f5cb3c9630ccb3ceae52d0e3b401e26240907fb8f67a5c94435342f36b3a473
pdf-font-stream PDF embedded font (sfnt) at offset 0x7444 9812 bytes