Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c46466f31a88037…

MALICIOUS

PDF

54.7 KB Created: 2020-08-11 23:21:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e086974f3bc2b8f64c2c1483f39d669e SHA-1: 9842c75608432426096857753fd0aa9f7015ad8a SHA-256: 2c46466f31a88037dbda6ad10c32a753d18b96e5b1ef39b6cd869d4f523d502b
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.cc, disguised with a seemingly relevant keyword. The ML classifier strongly indicated maliciousness. The document body, though heavily obfuscated, contains the same redirector URL and numerous other URLs hosted on various domains, suggesting a link farm or distribution network. The presence of a malicious redirector indicates an attempt to lead the user to a malicious site, likely for further exploitation or credential harvesting.

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/wb?keyword=elementary%20combinatorics%20pdf
    • http://files.encoreth.com/uploads/1/3/2/6/132696030/debewosoxegibe_nefolejokiv.pdf
    • http://files.emrglab.org/uploads/1/3/0/7/130776592/kagiwiwagib.pdf
    • http://files.wonderfulthings.org.uk/uploads/1/3/1/4/131437312/lawefamamina.pdf
    • http://files.jakeblakemetals.com/uploads/1/3/1/4/131437380/9569951.pdf
    • http://files.eurekaforensicservices.com/uploads/1/3/2/6/132681378/kufovofafejotudadu.pdf
    • https://cdn.shopify.com/s/files/1/0427/7708/4070/files/pewikinudoxi.pdf
    • https://cdn.shopify.com/s/files/1/0429/9092/8026/files/sownictwo_angielski_poziom_a1.pdf
    • https://cdn.shopify.com/s/files/1/0430/3332/9817/files/43464921082.pdf
    • https://cdn.shopify.com/s/files/1/0439/7996/4574/files/62826872600.pdf
    • https://cdn.shopify.com/s/files/1/0431/9890/6528/files/50745324754.pdf
    • https://cdn.shopify.com/s/files/1/0432/7908/9824/files/83757119759.pdf
    • https://cdn.shopify.com/s/files/1/0434/6245/9544/files/guwazubamevelapudo.pdf
    • https://cdn.shopify.com/s/files/1/0431/5653/7505/files/don_giovanni_overture.pdf
    • https://cdn.shopify.com/s/files/1/0431/9599/0175/files/surizuvivaloxaruv.pdf
    • https://cdn.shopify.com/s/files/1/0433/3781/0075/files/lezobodizajiximani.pdf
    • https://cdn.shopify.com/s/files/1/0432/6499/9590/files/xamakukaba.pdf
    • https://cdn.shopify.com/s/files/1/0434/3490/1671/files/zufojunajajadal.pdf
    • https://cdn.shopify.com/s/files/1/0430/2720/2205/files/wozivirapesorumewosamab.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000089f2.bin
e541758f17be3af02acbae67a77042835b8502490f9e3b472525ff77852153fc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x89F2 5288 bytes
font_01_sfnt_off00009bcc.bin
01b3a49f1a1369e65fe0aff2b9e6569707c86cf7338c69cf6ff9d3d1e07e3e88		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9BCC 10460 bytes
font_02_sfnt_off0000bf55.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBF55 4324 bytes

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