Malicious PDF — malware analysis report

Static analysis result for SHA-256 6dcc1f70f0299d2b…

MALICIOUS

PDF

41.1 KB Created: 2020-08-18 23:05:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 61828cab0032eb9c329590a23297e426 SHA-1: 6b992ef3ef64598842ca77a70b70fe5378f4283e SHA-256: 6dcc1f70f0299d2be17085344f819f165cecd9f227c58cec521d2d9624428db6
154 Risk Score

Malware Insights

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

The PDF contains a link farm designed to redirect users to malicious infrastructure, specifically identified by the heuristic PDF_MALICIOUS_REDIRECTOR_LINK. The document body, though heavily obfuscated, contains a URL that points to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The presence of numerous external links suggests an attempt to distribute malicious content or engage in SEO manipulation for malicious purposes.

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/pify?keyword=gammon+construction+annual+report+2017
    • http://sexow.azzarodogs.com/uploads/1/3/0/8/130813509/5829907.pdf
    • http://files.beautydetangled.com/uploads/1/3/2/3/132303147/xivugi.pdf
    • http://jisafi.imaginerespiteservices.com/uploads/1/3/2/3/132303382/favuwujumewi_buzorusube.pdf
    • http://files.crudeoilcalendars.com/uploads/1/3/0/7/130739883/5245763.pdf
    • http://tikoz.icgtouring.com/uploads/1/3/1/3/131383839/8920522.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/6108/3301/files/84227853663.pdf
    • https://cdn.shopify.com/s/files/1/0430/1560/2339/files/99291065898.pdf
    • https://cdn.shopify.com/s/files/1/0433/5419/4070/files/aditya_hrudayam_telugu_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/9452/3552/files/fonipugorepepefo.pdf
    • https://cdn.shopify.com/s/files/1/0437/1942/6197/files/john_deere_2240.pdf
    • https://cdn.shopify.com/s/files/1/0431/5791/3754/files/rasamej.pdf
    • https://cdn.shopify.com/s/files/1/0429/8099/9321/files/digital_dash_drake_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/7994/9718/files/puzakivusovadug.pdf
    • https://cdn.shopify.com/s/files/1/0431/4277/4935/files/ascendance_trilogy.pdf
    • https://cdn.shopify.com/s/files/1/0436/2698/7680/files/44989969237.pdf
    • https://cdn.shopify.com/s/files/1/0431/9707/1524/files/29146642284.pdf
    • https://cdn.shopify.com/s/files/1/0433/7677/1224/files/isometric_paper_template.pdf
    • https://cdn.shopify.com/s/files/1/0430/9411/4457/files/vupojibut.pdf
    • https://cdn.shopify.com/s/files/1/0436/0588/5090/files/jezogizibuximolaz.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000615f.bin
ced37378734e660153c3570b842d1355651203bb5d0a208335771e3042ff63ae		 pdf-font-stream PDF embedded font (sfnt) at offset 0x615F 5516 bytes
font_01_sfnt_off00007412.bin
d314bce5f22c2840ce9534b21ee69f741abdf84f0296678eef2f7a44a1a26eaa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7412 10304 bytes

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