Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b0c52df3e3faf37…

MALICIOUS

PDF

35.3 KB Created: 2020-08-03 13:41:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c47e728775545e7c73c88456283e5b32 SHA-1: a553b0c811c5f15c1d682533bcb87f722924c6d4 SHA-256: 6b0c52df3e3faf376ed16554db3a577893dd26e1e5817d4f61fe3c7370e6dbd5
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external resources. One prominent URL, 'https://ttraff.ru/pify?keyword=exercises+present+perfect+affirmative+negative+interrogative+pdf', is flagged as a malicious redirector. The document body, though heavily obfuscated, also contains this URL, suggesting an attempt to lure users to malicious infrastructure. The presence of numerous Shopify links, some flagged as benign, alongside the malicious redirector, indicates a link farm strategy.

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=exercises+present+perfect+affirmative+negative+interrogative+pdf
    • http://files.southlandfamilyclub.com/uploads/1/3/1/3/131379371/e862cb.pdf
    • http://files.325986690869568534.com/uploads/1/3/1/3/131380158/gadivujifemavoz.pdf
    • http://files.joquinn.com.au/uploads/1/3/2/6/132681409/3960048d2abc04.pdf
    • http://files.labyrinthsales.com/uploads/1/3/1/4/131412558/4933783.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/7038/2490/files/74295767783.pdf
    • https://cdn.shopify.com/s/files/1/0450/9948/3301/files/years_in_dog_years.pdf
    • https://cdn.shopify.com/s/files/1/0430/1075/2663/files/nerawe.pdf
    • https://cdn.shopify.com/s/files/1/0434/0118/3397/files/43787254701.pdf
    • https://cdn.shopify.com/s/files/1/0429/9672/7957/files/joxatow.pdf
    • https://cdn.shopify.com/s/files/1/0427/8996/1884/files/dojazelazexuso.pdf
    • https://cdn.shopify.com/s/files/1/0432/9452/3552/files/sublime_text_3_license_key.pdf
    • https://cdn.shopify.com/s/files/1/0431/9323/7665/files/95965787908.pdf
    • https://cdn.shopify.com/s/files/1/0429/2270/5063/files/60926896945.pdf
    • https://cdn.shopify.com/s/files/1/0436/9973/2633/files/6927387391.pdf
    • https://cdn.shopify.com/s/files/1/0431/0522/2818/files/pivinopazolamut.pdf
    • https://cdn.shopify.com/s/files/1/0434/6275/4461/files/sevoflurane_anesthesia.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_off00004af1.bin
b70e1c70f012fc8ab11b9410ce2eb798e5f0515dad5af4842d76f8934b865400		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4AF1 5528 bytes
font_01_sfnt_off00005db9.bin
7e37ecde4b8a5108281999348b2694106b98e65ce4e37128cf742d8b453021bd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5DB9 9940 bytes

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