Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b9159fa98e1346e…

MALICIOUS

PDF

36.9 KB Created: 2020-08-05 16:20:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0e4c20114ac259d6a78d52c85591e6e7 SHA-1: 67a58fa886952305791382a76f159e78911a74cc SHA-256: 2b9159fa98e1346eb4d7f75dbede3d33578f281181421d5ed0002ad59f0d6dea
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, but one critical link redirects to a known malicious infrastructure at 'ttraff.ru'. This suggests the document is part of a link farm designed to lure users with seemingly legitimate document titles and then redirect them to malicious sites. The ML classifier strongly supports the malicious nature of this PDF.

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=ashby+material+selection+in+mechanical+design+pdf
    • http://files.speakingaboutautism.com/uploads/1/3/0/8/130813510/f561b9c66c5.pdf
    • http://files.ianwhittaker.com/uploads/1/3/1/1/131164419/geboxa.pdf
    • http://files.ecigsuperstores.co.uk/uploads/1/3/1/4/131407511/4eecf9e35d33.pdf
    • http://zejiz.jackiehagan.org/uploads/1/3/0/7/130739777/ed98769124.pdf
    • https://cdn.shopify.com/s/files/1/0436/9635/7530/files/86308936142.pdf
    • https://cdn.shopify.com/s/files/1/0434/7772/9432/files/59628497235.pdf
    • https://cdn.shopify.com/s/files/1/0440/0663/7726/files/queen_s_gate_spiral_chaos_english.pdf
    • https://cdn.shopify.com/s/files/1/0433/6097/7048/files/gowuperovuguso.pdf
    • https://cdn.shopify.com/s/files/1/0432/0978/5512/files/samigefataduxiru.pdf
    • https://cdn.shopify.com/s/files/1/0432/5461/2123/files/30996718421.pdf
    • https://cdn.shopify.com/s/files/1/0438/0118/2370/files/fopofimituxesobipijil.pdf
    • https://cdn.shopify.com/s/files/1/0431/0797/5317/files/5685686381.pdf
    • https://cdn.shopify.com/s/files/1/0434/7628/7648/files/49942024855.pdf
    • https://cdn.shopify.com/s/files/1/0437/8840/2839/files/jilokutimozivawudekod.pdf
    • https://cdn.shopify.com/s/files/1/0431/8006/4936/files/vabetiviwasisufejimeg.pdf
    • https://cdn.shopify.com/s/files/1/0431/2668/5858/files/79687635553.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_off0000446c.bin
04c06c8332ec6ceea59a4693da3ec42399207b59b23cad161bf8e5862db1215b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x446C 5588 bytes
font_01_sfnt_off0000573a.bin
15a3d759f3401baee3e5f956192764fbcf9990e7207356f9f21ee3b541c2aea9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x573A 9184 bytes
font_02_sfnt_off0000768b.bin
7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x768B 4324 bytes

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