Malicious PDF — malware analysis report

Static analysis result for SHA-256 35e7957f950323d8…

MALICIOUS

PDF

44.3 KB Created: 2020-08-06 09:14:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0c94e962507834ac97fe461bb5bc302d SHA-1: e8af7c7f946703810e35257445f51b2e13ff0d19 SHA-256: 35e7957f950323d869af19f1b12e902fc824328ebd451c7d06cd8dd53b63f144
152 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 hosting other PDFs, suggesting a link farm for SEO manipulation. One critical heuristic identified a link to a known malicious redirector, ttraff.ru, which is used to lure users with the promise of a free book download. The ML classifier strongly supports the malicious nature of this PDF. 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.ru/pify?keyword=the+art+book+big+ideas+simply+explained+pdf+free+download
    • http://zurisebig.advocatesforsj.com/uploads/1/3/1/3/131380213/a1a3b6d9f.pdf
    • http://files.wellwithart.com/uploads/1/3/1/4/131438151/8576640.pdf
    • http://files.firstcomeslovekamloops.ca/uploads/1/3/1/4/131453588/ec548.pdf
    • https://cdn.shopify.com/s/files/1/0434/0508/2780/files/domirerut.pdf
    • https://cdn.shopify.com/s/files/1/0431/2816/0413/files/boy_scout_fieldbook.pdf
    • https://cdn.shopify.com/s/files/1/0428/8672/5799/files/43148012830.pdf
    • https://cdn.shopify.com/s/files/1/0429/2621/1238/files/pumiriler.pdf
    • https://cdn.shopify.com/s/files/1/0430/1871/5289/files/48291815725.pdf
    • https://cdn.shopify.com/s/files/1/0434/2149/9548/files/fedalatez.pdf
    • https://cdn.shopify.com/s/files/1/0430/1642/1529/files/silixakomo.pdf
    • https://cdn.shopify.com/s/files/1/0432/3590/1602/files/wadavafizulufidisikup.pdf
    • https://cdn.shopify.com/s/files/1/0432/6070/6971/files/linukagukafuxusekovewa.pdf
    • https://cdn.shopify.com/s/files/1/0433/7857/3464/files/nitanax.pdf
    • https://cdn.shopify.com/s/files/1/0439/1901/6104/files/87174627796.pdf
    • https://cdn.shopify.com/s/files/1/0429/8833/9361/files/acetilcisteina_bula_eurofarma.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_off00005b43.bin
e6026c820516d1db4676feae2b577a3f03e18d4a1b9ba2e10c79e97bce8de6a9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B43 5868 bytes
font_01_sfnt_off00006f25.bin
27facea08f760b6c9ccffc63dc3354f6ddb502aa9495885ea4bb65c44df333a7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F25 5896 bytes
font_02_sfnt_off00007f76.bin
5cf74eab9ae95579922cb543393a9638cfa140758b7fdd72bdcfa55cc5342182		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F76 9980 bytes

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