Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3c0b61c20092c29…

MALICIOUS

PDF

36.3 KB Created: 2020-08-29 10:52:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1531e9e2497c89d9ac7785dca866f7d5 SHA-1: 2881428498aac03a71bb26cfae658330f17e8baf SHA-256: a3c0b61c20092c29ba8b2213044dd264677ef9bf75b525d877581f0a8c6c5901
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing for a malicious redirector. The document body, though heavily obfuscated, contains text referencing 'Ariana grande christmas and chill' and the malicious URL, suggesting a lure to a phishing or malware distribution site. The ML classifier also strongly indicated maliciousness.

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=ariana+grande+christmas+and+chill
    • https://static.usrfiles.com/ugd/b8c837_0705a1967a814bac8f7f89490c9883d3.pdf
    • https://static.usrfiles.com/ugd/b8c837_abd7ae0231f74153a4cf2db03d9db9d9.pdf
    • https://static.usrfiles.com/ugd/b8c837_a2baa756b1804757bbb439f87c2f8d47.pdf
    • https://static.usrfiles.com/ugd/b8c837_63247470740942c4ba67028261931cfb.pdf
    • https://static.usrfiles.com/ugd/b8c837_f647410999b54aa7bdbb06b87dd16016.pdf
    • https://cdn.shopify.com/s/files/1/0434/3024/8600/files/94078532940.pdf
    • https://cdn.shopify.com/s/files/1/0428/2341/8019/files/6806021592.pdf
    • https://cdn.shopify.com/s/files/1/0435/6295/9006/files/fopujowezatuwofavetilazid.pdf
    • https://static.usrfiles.com/ugd/b8c837_9f7f7a0500fc45cfb2cc1eef268515cd.pdf
    • https://static.usrfiles.com/ugd/b8c837_590b5e65201b431d8452dcceb3ed0810.pdf
    • https://static.usrfiles.com/ugd/b8c837_d4397369c88c4cf28bbac7d54e31e3ea.pdf
    • https://static.usrfiles.com/ugd/b8c837_9a2c7ab771be4782bb82ef33e6564db6.pdf
    • https://static.usrfiles.com/ugd/b8c837_4456d4e8d39a47e0b54fa0663237473a.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004315.bin
93aaaa7c3a38181fc6998f9a033da958997eb28e1c6e52bd33022def9500917b
pdf-font-stream PDF embedded font (sfnt) at offset 0x4315 5020 bytes
font_01_sfnt_off000053e1.bin
cc408759fbb5773ff36e2216bec8a8b2c1b036e177ae74b2676affdfd494d3ee
pdf-font-stream PDF embedded font (sfnt) at offset 0x53E1 10584 bytes
font_02_sfnt_off00007646.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3
pdf-font-stream PDF embedded font (sfnt) at offset 0x7646 4324 bytes