Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ac15513a5be0c4f…

MALICIOUS

PDF

56.1 KB Created: 2020-09-01 09:45:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5d4a9952d4e958da65fec9e0a475ab65 SHA-1: 184d11bc9284d779141a4e062c186e335b6ed63d SHA-256: 6ac15513a5be0c4f00c5f6ea749629cea18aad032d20ea2c1f6f73d9ee1e82e1
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains embedded links, one of which, https://ttraff.com/wix?keyword=nicolas+berdyaev+pdf, is flagged as a malicious redirector. The document also exhibits characteristics of a link farm, with numerous embedded URLs pointing to external PDF files. While no scripts were explicitly extracted, the presence of embedded URLs and the malicious redirector strongly suggest an attempt to lure users to malicious content, likely as part of a phishing or scam campaign.

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=nicolas+berdyaev+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/c618e9_51ee5384186541beb44421ed37afcba0.pdf
    • https://static.usrfiles.com/ugd/c836c3_fbb294c580d14c54be66ecc5f351c3bb.pdf
    • https://static.usrfiles.com/ugd/b8c837_bc759c359be643d1a5467d6609002bdf.pdf
    • https://static.usrfiles.com/ugd/3f80ec_341b98b2c79543648760de8fffadd5c2.pdf
    • https://static.usrfiles.com/ugd/c1108c_675bbe9e75f249ad8c6e4f22f6f2cd4b.pdf
    • https://cdn.shopify.com/s/files/1/0431/0004/5465/files/78549041704.pdf
    • https://cdn.shopify.com/s/files/1/0429/8942/0695/files/meant_to_be_video_song_free.pdf
    • https://cdn.shopify.com/s/files/1/0431/5450/5882/files/tinubezugopurumalejadus.pdf
    • https://cdn.shopify.com/s/files/1/0436/0703/1966/files/javascript_array_reduce.pdf
    • https://static.usrfiles.com/ugd/a31856_4efb27e4282841149afb23b89677c219.pdf
    • https://static.usrfiles.com/ugd/e5a943_26c7f976cd0b46debc8050f0bda21a32.pdf
    • https://static.usrfiles.com/ugd/b8c837_9cb973119c11473c929f99e9e82a0979.pdf
    • https://static.usrfiles.com/ugd/b8c837_a3c3082f7c82491f8803818f1078a616.pdf
    • https://static.usrfiles.com/ugd/b8c837_61b9b0d273c7467cb8f66c800ab13c0a.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xazijejizamoketabuguta.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/68513135127.pdf
    • https://cdn.shopify.com/s/files/1/0428/2620/3302/files/nipiwigewaletiraxawat.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009b97.bin
7cbe65b04474fdcfbd2433747be8133c0922e3fca43f098c32ed4d53f7178152		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9B97 5420 bytes
font_01_sfnt_off0000ae1d.bin
183a2ccb7af1b58150b72d72da5e0fb9cd3ebfa7ef71931ffc443a4037ec3594		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAE1D 11032 bytes

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