Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc612c80b5b5782a…

MALICIOUS

PDF

67.7 KB Created: 2020-08-29 22:18:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 18076f86d9b0cee70364798da64c7ac0 SHA-1: 086d6079324085ca8b76e5aa2982470b0e4b7b01 SHA-256: dc612c80b5b5782a241c4c0d62180d5eb940a7c20b482c48b4540c28a69f3755
152 Risk Score

Malware Insights

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

The PDF contains a high number of embedded links, many of which point to a link farm designed to redirect users. One of the primary links, 'https://ttraff.com/wix?keyword=the+book+of+coming+forth+by+night+mi', is identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body appears to be obfuscated or corrupted, but the presence of the malicious URL is the primary indicator of compromise.

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=the+book+of+coming+forth+by+night+mi
    • https://static.usrfiles.com/ugd/b8c837_1d24299663f74cb9828fc4d8b1de3ae4.pdf
    • https://static.usrfiles.com/ugd/b8c837_45efedfe25864268ad47df863318a9b9.pdf
    • https://static.usrfiles.com/ugd/b8c837_d9d6be1a28a548239a37b2455aadb723.pdf
    • https://cdn.shopify.com/s/files/1/0436/1850/0765/files/kofibukemitewefuzipolebax.pdf
    • https://static.usrfiles.com/ugd/0d002d_2d4865f6385d4a25979734905b10d20d.pdf
    • https://static.usrfiles.com/ugd/b8c837_c5696e3f709347e98e4e32ffb672a74c.pdf
    • https://cdn.shopify.com/s/files/1/0438/4132/3170/files/nerinidijemu.pdf
    • https://cdn.shopify.com/s/files/1/0432/1034/2563/files/83353969364.pdf
    • https://cdn.shopify.com/s/files/1/0433/8047/4014/files/adobe_after_effects_cs6_filehippo.pdf
    • https://cdn.shopify.com/s/files/1/0429/5966/7363/files/fekubab.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_off0000cdb3.bin
08a3b8457f9add2a9e05a956480336fa40a6f6200cf8b17d6173180740d82ca3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCDB3 5128 bytes
font_01_sfnt_off0000df1a.bin
b319669eed5f34b4158a1dc069d928c79283a1c02a0f893613acebf522ea5170		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF1A 10372 bytes

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