Malicious PDF — malware analysis report

Static analysis result for SHA-256 896e5c63113d069e…

MALICIOUS

PDF

63.7 KB Created: 2020-08-17 11:21:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fa754562129d42eb17d28d7cf4cca90a SHA-1: c059c0b44370aad11e5584ece4d066f469fac96e SHA-256: 896e5c63113d069e9c8deeb66e6bb9c96077d17dd5a71616704415673c46671c
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF was flagged as malicious due to a high number of embedded links, many of which lead to a redirector service. The ML classifier also strongly indicated maliciousness. The document body contains the URL https://ttraff.com/pify?keyword=fly+sheet+def, which is a known malicious redirector, and also lists numerous other PDF files hosted on Shopify domains. This suggests a link farm or redirection strategy to obscure the ultimate malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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/pify?keyword=fly+sheet+def
    • http://files.escapetoplaya.com/uploads/1/3/1/0/131070178/laxola.pdf
    • http://files.nnhst2.org/uploads/1/3/1/3/131379612/lufuxofuwusuwufaposi.pdf
    • http://files.carolavedonsavage.com/uploads/1/3/1/3/131384573/7e5f86cafb4.pdf
    • https://cdn.shopify.com/s/files/1/0432/3626/2050/files/wesineremitademiru.pdf
    • https://cdn.shopify.com/s/files/1/0436/6221/3273/files/98701182116.pdf
    • https://cdn.shopify.com/s/files/1/0427/6033/9623/files/exercise_to_be_present_simple.pdf
    • https://cdn.shopify.com/s/files/1/0429/1647/9132/files/lazakemobedipamafuwipi.pdf
    • https://cdn.shopify.com/s/files/1/0432/2738/1920/files/58167107501.pdf
    • https://cdn.shopify.com/s/files/1/0432/5205/6227/files/logo_quiz_free_ultimate_guess_answers.pdf
    • https://cdn.shopify.com/s/files/1/0431/8032/7070/files/tn_budget_2020_in_tamil.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/69892687871.pdf
    • https://cdn.shopify.com/s/files/1/0431/8671/6830/files/82369750286.pdf
    • https://cdn.shopify.com/s/files/1/0434/2402/2677/files/nugumuva.pdf
    • https://cdn.shopify.com/s/files/1/0431/6125/6096/files/dejetigiporu.pdf
    • https://cdn.shopify.com/s/files/1/0432/7283/1134/files/love_and_life_billings_method.pdf
    • https://cdn.shopify.com/s/files/1/0434/9689/8724/files/91430025193.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 8

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_008_off0000b917.bin
678507fb5c7379505d7ecc23200c20d7ce741a2a8e518a70e1e2ceb0225d2f72		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xB917 16988 bytes
font_00_sfnt_off000054ac.bin
15c33f173285a5b482a272c12be6f048f057e88a179c44843ab8364e8f823874		 pdf-font-stream PDF embedded font (sfnt) at offset 0x54AC 5388 bytes
font_01_sfnt_off000067b6.bin
7cc7b53c93e415719bb23194bbf09770749682d06db0448730d1c684a9bcdc2a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67B6 4268 bytes
font_02_sfnt_off00007640.bin
7f79eb054bcb1094380c12677fb7ef7a69c26dae59ac259d72740468672b17a6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7640 3460 bytes
font_03_sfnt_off00008348.bin
d4b5ceb0f794979623ba217943908417d7b712bf9b11a548f94fc7e316caea11		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8348 4820 bytes
font_04_sfnt_off000092da.bin
fbb0fa359ac45f8187e0c48dba07939b9958c793a30c0abe56da3b7b6cb4acfa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x92DA 11232 bytes
font_06_sfnt_off0000d151.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD151 4324 bytes
font_07_sfnt_off0000df53.bin
b23b1818fd088f16d19f92c189db92a3b087d26ae22726544414c445d876ead9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF53 3908 bytes

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