Malicious PDF — malware analysis report

Static analysis result for SHA-256 d03355ba76568477…

MALICIOUS

PDF

46.1 KB Created: 2020-08-30 04:13:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 312b4612d2bfcc6ade81ed52a158fe2c SHA-1: ec2ec69d26a42642eb4d967275f1c26d87c1fed9 SHA-256: d03355ba76568477c33431528a401eb014ca8a6354141cf5cb84b9f718cffc31
152 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with one URL pointing to a known malicious redirector. The document body, though heavily obfuscated, contains references to the malicious URL and other benign-looking PDF files hosted on static.usrfiles.com. This suggests the PDF is designed to redirect users to malicious infrastructure, likely for phishing or malware distribution.

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.cc/wix?keyword=sims+4+custom+drinks
    • https://static.usrfiles.com/ugd/b8c837_fa32e7286ed54b8caacc51df05390803.pdf
    • https://static.usrfiles.com/ugd/0c41e7_accff21c7c5a4a14b7c910cb0d095751.pdf
    • https://static.usrfiles.com/ugd/b8c837_a3e7be759fe04d28b8091b7f5141e79f.pdf
    • https://static.usrfiles.com/ugd/5bb01c_f3a692cbb9064ec48be13780dc671f1d.pdf
    • https://static.usrfiles.com/ugd/b8c837_9ff37e4a526f42fd805e670bfd6c74ac.pdf
    • https://cdn.shopify.com/s/files/1/0432/9593/2584/files/jatojaxenugumipivo.pdf
    • https://cdn.shopify.com/s/files/1/0428/2351/6323/files/71456052793.pdf
    • https://cdn.shopify.com/s/files/1/0436/5398/8510/files/45601587764.pdf
    • https://cdn.shopify.com/s/files/1/0430/4722/3458/files/que_es_un_astrolabio.pdf
    • https://cdn.shopify.com/s/files/1/0434/8451/2418/files/55925252222.pdf
    • https://static.usrfiles.com/ugd/576447_801bffe4f7c447689244ac5987324bd9.pdf
    • https://static.usrfiles.com/ugd/b8c837_976983f0ae774b2dadcb0fd2b6769143.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_off0000777e.bin
140a3ed222c4658f3bce436ed9bced3595265612687b0ed3ca074ab7bed0f233		 pdf-font-stream PDF embedded font (sfnt) at offset 0x777E 5096 bytes
font_01_sfnt_off000088bc.bin
608629ff4af41aab841521d0107c700d4b2503ecd5ec382adb2bb81794bf30f6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x88BC 10216 bytes

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