Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fc7e78ebbe09d6a…

MALICIOUS

PDF

49.2 KB Created: 2020-07-27 15:45:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 25dd710cc15cb530b0b13703fefd280c SHA-1: 7e448b2ce6b0e027874156b8a0d22facb8082b48 SHA-256: 9fc7e78ebbe09d6ae3fe67577024b53e1a39781f5796592294198a11f1c74409
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, many of which point to Shopify domains, but one critical heuristic identified a link to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body is heavily obfuscated, but the presence of a link farm and a malicious redirector suggests an attempt to drive traffic to potentially harmful sites.

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=fractions+addition+worksheets
    • http://files.computerscpr.com/uploads/1/3/2/7/132740860/xubujolodosetejokuv.pdf
    • http://files.audiostak.com/uploads/1/3/1/4/131454899/328808.pdf
    • http://files.msoatucla.org/uploads/1/3/1/1/131163740/tiroru-rajujumudejex-mikusobuponateg-movuvidevokan.pdf
    • http://files.maritzavives.com/uploads/1/3/2/8/132815346/zotowelew_lotavapibo_zevubebesoden_sodagufeje.pdf
    • https://cdn.shopify.com/s/files/1/0431/4939/4080/files/lejobaw.pdf
    • https://cdn.shopify.com/s/files/1/0431/8127/7345/files/96258337343.pdf
    • https://cdn.shopify.com/s/files/1/0429/7113/6154/files/momogixejufibitax.pdf
    • https://cdn.shopify.com/s/files/1/0431/6856/3351/files/17650619745.pdf
    • https://cdn.shopify.com/s/files/1/0435/2809/3856/files/8557746906.pdf
    • https://cdn.shopify.com/s/files/1/0431/1541/3661/files/lenowajujimekup.pdf
    • https://cdn.shopify.com/s/files/1/0430/8841/2836/files/fapunedimusategozi.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/65939759823.pdf
    • https://cdn.shopify.com/s/files/1/0432/8475/8696/files/48530536999.pdf
    • https://cdn.shopify.com/s/files/1/0433/3325/5323/files/gewaves.pdf
    • https://cdn.shopify.com/s/files/1/0429/6481/1927/files/19038430182.pdf
    • https://cdn.shopify.com/s/files/1/0434/2661/1357/files/77910576627.pdf
    • https://cdn.shopify.com/s/files/1/0429/4872/2851/files/lelifipizi.pdf
    • https://cdn.shopify.com/s/files/1/0427/5005/0460/files/70320253020.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000084f0.bin
1953e49f7625740f0c9598dcf7082caf8f833066f592c52765ff8b35927bbfd9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x84F0 4896 bytes
font_01_sfnt_off00009593.bin
910ca7c8843ddb7033bf48903547c847e6686f6215b0298c56c9449eddd48a5a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9593 9800 bytes

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