Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c9f6e504c858beb…

MALICIOUS

PDF

64.9 KB Created: 2020-08-02 11:10:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2c6c9e3cb5c09f62439161b0025b30a7 SHA-1: bd804cc4a28b29951225e587dd83e27226080272 SHA-256: 8c9f6e504c858bebd823a25b04e6552df8b9b05011464407161a0cd14eea2a68
154 Risk Score

Malware Insights

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

The PDF file was flagged as malicious due to a critical heuristic identifying a link to a known malicious redirector. The document body, though heavily obfuscated, contains the URL https://ttraff.cc/pify?keyword=1980+honda+cm400t, which is also listed as a malicious redirector. The presence of a large number of embedded links, many pointing to Shopify domains, suggests a link farm or SEO poisoning tactic to distribute malicious content. No scripts were extracted from this sample.

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/pify?keyword=1980+honda+cm400t
    • http://files.luxtan.lu/uploads/1/3/0/8/130813135/991150.pdf
    • http://files.hookandarrow.co.nz/uploads/1/3/0/7/130776230/1b8b12c.pdf
    • http://files.nykcattlecompany.com/uploads/1/3/0/7/130775665/perekoratadana_xumugebikinifa.pdf
    • https://cdn.shopify.com/s/files/1/0430/1488/1433/files/59569527529.pdf
    • https://cdn.shopify.com/s/files/1/0437/7113/4106/files/11223803508.pdf
    • https://cdn.shopify.com/s/files/1/0430/0223/2983/files/68054125238.pdf
    • https://cdn.shopify.com/s/files/1/0433/8886/2614/files/91235842195.pdf
    • https://cdn.shopify.com/s/files/1/0427/5834/0774/files/58255324916.pdf
    • https://cdn.shopify.com/s/files/1/0432/0156/0737/files/vefukubumemanifanu.pdf
    • https://cdn.shopify.com/s/files/1/0428/2492/5347/files/36315694498.pdf
    • https://cdn.shopify.com/s/files/1/0432/5857/7046/files/kitisukopabuso.pdf
    • https://cdn.shopify.com/s/files/1/0435/9074/6271/files/sakiwoxadodebodepozu.pdf
    • https://cdn.shopify.com/s/files/1/0437/0215/7466/files/piteziwepinofaketiwa.pdf
    • https://cdn.shopify.com/s/files/1/0428/4468/4454/files/28110398235.pdf
    • https://cdn.shopify.com/s/files/1/0431/8353/8331/files/93014878275.pdf
    • https://cdn.shopify.com/s/files/1/0431/6558/1468/files/gilded_alter_osrs.pdf
    • https://cdn.shopify.com/s/files/1/0438/1766/4674/files/labifobokorajos.pdf
    • https://cdn.shopify.com/s/files/1/0434/2389/1618/files/85737744775.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_off0000adca.bin
3c2813a6fba2c7a230a9c64f320feb8e7e2eb23e7f706c2f36ceadef572fec75		 pdf-font-stream PDF embedded font (sfnt) at offset 0xADCA 4796 bytes
font_01_sfnt_off0000be98.bin
19836d370c646f8742017d644abea80eed608b9236b2a3f1fef7605987d5f635		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBE98 5408 bytes
font_02_sfnt_off0000d0de.bin
18cefc286e2aef97c5dc79e3dc0c66acd6572bef266a7e51e234823f8d47dc84		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD0DE 10492 bytes

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