Malicious PDF — malware analysis report

Static analysis result for SHA-256 0381b48292779951…

MALICIOUS

PDF

44.7 KB Created: 2020-08-31 12:25:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6c8e16e8a1be1524296b9db95fea1bd4 SHA-1: df5b2f5268149061311ac8e6647e0d69c09e1551 SHA-256: 0381b48292779951652dcc782684bd54b9dd1cc6b3c42007fa0b292cb2364dc8
154 Risk Score

Malware Insights

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

The PDF contains embedded URLs, with one specifically identified as a malicious redirector. The document body, though heavily obfuscated, contains text suggesting it is related to 'sheet music' and includes the malicious URL. The presence of numerous external PDF links, many pointing to benign content, suggests a link farm used to obscure the malicious redirector. 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=somewhere+in+time+sheet+music
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://static.usrfiles.com/ugd/e643da_8e3519408ab4424b84a5fb378507097c.pdf
    • https://static.usrfiles.com/ugd/97493d_1db3f775b33f4f04919760259af6afa5.pdf
    • https://static.usrfiles.com/ugd/8cbfce_e708f357b6a94872848f758302971c82.pdf
    • https://static.usrfiles.com/ugd/c1de29_fdeb6819af9c4a288c986a511ea24db9.pdf
    • https://static.usrfiles.com/ugd/b8c837_687d5e1acddd42a4a569c6aba716f1fb.pdf
    • https://static.usrfiles.com/ugd/b8c837_c6d535e08de14c388e95b2ff94021b16.pdf
    • https://static.usrfiles.com/ugd/b8c837_7e6b4f78c61047bbb36f3180580c07c0.pdf
    • https://static.usrfiles.com/ugd/b8c837_7cd07d6a290341e78b8e927004c7b71b.pdf
    • https://cdn.shopify.com/s/files/1/0431/6246/8516/files/37257862451.pdf
    • https://cdn.shopify.com/s/files/1/0434/5869/1232/files/cartooning_philosophy_and_practice.pdf
    • https://cdn.shopify.com/s/files/1/0428/2197/6220/files/39399334583.pdf
    • https://cdn.shopify.com/s/files/1/0436/2679/1075/files/english_synonyms_and_antonyms_with_meaning.pdf
    • https://cdn.shopify.com/s/files/1/0438/1740/2530/files/bf4_emblem_import.pdf
    • https://cdn.shopify.com/s/files/1/0430/3673/7699/files/minobaxizozufirizom.pdf
    • https://cdn.shopify.com/s/files/1/0461/4396/3299/files/best_wallpapers_for_laptop_free.pdf
    • https://cdn.shopify.com/s/files/1/0427/6387/8566/files/24161432986.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000064ca.bin
41673b8fb8d0a851423bfae6dd4288d090275c009a9255c39746e51756a91c6a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64CA 4872 bytes
font_01_sfnt_off00007543.bin
994fabd302a9edb04da789999a181a63ab19dcae7f04bef2dce934c739e02665		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7543 10060 bytes
font_02_sfnt_off000097b5.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x97B5 4324 bytes

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