Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9a91e029bad3055…

MALICIOUS

PDF

44.9 KB Created: 2020-08-12 22:54:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1f48ba8ecfd755f9f9af524307a0c98c SHA-1: ecd3b85c722338b6c16aea56a79e85242b92845a SHA-256: c9a91e029bad30557de7705ba086f881b7ac88873fba83ede1c1a25958d1020c
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.ru/pify?keyword=esv+reformation+study+bible+pdf'. This URL is presented within the document body, disguised as a Bible study resource, to entice users to click. The presence of numerous other links to Shopify domains, while marked as benign, suggests a link farm or SEO manipulation tactic. The ML classifier also strongly indicated maliciousness.

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=esv+reformation+study+bible+pdf
    • http://files.happy-cow-bakery.com/uploads/1/3/0/8/130813550/f7aba42b9.pdf
    • http://files.artisticreteleesburg.com/uploads/1/3/1/3/131384284/b1e79e40732.pdf
    • http://files.theboothtique.com/uploads/1/3/0/7/130775750/129706.pdf
    • http://files.cogopner.org/uploads/1/3/0/9/130969809/a0d4998b.pdf
    • http://wuzavikul.streetical.com/uploads/1/3/0/9/130969723/vezimumunanaze_kotejibokamezub_bojixo_mopelafunuxo.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/10809735118.pdf
    • https://cdn.shopify.com/s/files/1/0430/5007/4269/files/gulama.pdf
    • https://cdn.shopify.com/s/files/1/0428/7594/5113/files/jujonev.pdf
    • https://cdn.shopify.com/s/files/1/0432/2754/5763/files/6892569013.pdf
    • https://cdn.shopify.com/s/files/1/0437/9148/3042/files/madea_plays_online_free.pdf
    • https://cdn.shopify.com/s/files/1/0437/7614/7607/files/running_man_kshow.pdf
    • https://cdn.shopify.com/s/files/1/0432/2636/6111/files/dudejukafufofure.pdf
    • https://cdn.shopify.com/s/files/1/0430/2507/2282/files/35636486435.pdf
    • https://cdn.shopify.com/s/files/1/0437/2060/5848/files/kabedegotobup.pdf
    • https://cdn.shopify.com/s/files/1/0432/5654/5433/files/lavifexekidozexexima.pdf
    • https://cdn.shopify.com/s/files/1/0427/9291/1007/files/kezuxigu.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004741.bin
61232f5dbf168d5a0511f819f0a8173e72172023e7ff210a397e633c97edcf48		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4741 5328 bytes
font_01_sfnt_off00005945.bin
55983119c7166f65ff4b98bea229581d3835161f5300376e91a943a114546dc6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5945 9764 bytes
font_02_sfnt_off00007ae2.bin
7e3b2e8555a6995d87b6dc45889fababba8481d2bb34d02121d0c346a0856741		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7AE2 18640 bytes
font_03_sfnt_off00009845.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9845 4324 bytes

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