Malicious PDF — malware analysis report

Static analysis result for SHA-256 734b25a62360ca2c…

MALICIOUS

PDF

41.3 KB Created: 2020-08-04 09:24:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: da91819059aedc169a64691db4f52321 SHA-1: 036708b609ba088734281b9c79b754aee4285233 SHA-256: 734b25a62360ca2c1d718f37123b8da2f9cd899a28e65490746c035625522e65
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by an ML classifier and contains a large number of external links, including one to a known malicious redirector. The document body, though heavily obfuscated, contains URLs that appear to be part of a link farm. This suggests the primary purpose is to redirect users to potentially harmful content or to manipulate search engine results.

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=fra+forward+rate+agreement+pdf
    • http://files.patsysbarandgrill.com/uploads/1/3/0/9/130969717/wuxirib.pdf
    • http://files.ruthbrambleceramics.com/uploads/1/3/1/4/131438616/lasesufo_fimap.pdf
    • http://files.vlantroop.com/uploads/1/3/1/4/131437983/39f591041b.pdf
    • http://files.blackcountryfishing.co.uk/uploads/1/3/0/8/130815095/zugaj.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/7365/0334/files/89531439058.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/fikikotiv.pdf
    • https://cdn.shopify.com/s/files/1/0429/0379/7913/files/komagivotivowilixoko.pdf
    • https://cdn.shopify.com/s/files/1/0431/8996/0865/files/lidoli.pdf
    • https://cdn.shopify.com/s/files/1/0430/6249/3345/files/gusebotofuvunudupoti.pdf
    • https://cdn.shopify.com/s/files/1/0429/8794/6133/files/13089093762.pdf
    • https://cdn.shopify.com/s/files/1/0427/9628/6111/files/fivatobaxij.pdf
    • https://cdn.shopify.com/s/files/1/0430/8631/5671/files/fetedebawuxalezisi.pdf
    • https://cdn.shopify.com/s/files/1/0432/2004/1886/files/60617540236.pdf
    • https://cdn.shopify.com/s/files/1/0434/8254/6341/files/free_ringtones_and_ringbacks.pdf
    • https://cdn.shopify.com/s/files/1/0431/9857/8848/files/quickens_loans_arena_seat_viewer.pdf
    • https://cdn.shopify.com/s/files/1/0431/1423/4016/files/99893546316.pdf
    • https://cdn.shopify.com/s/files/1/0430/2071/4137/files/peminesiropob.pdf
    • https://cdn.shopify.com/s/files/1/0433/8486/4917/files/zusalenatiditodonuzuje.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_off000062a3.bin
4ac4042ec2079c3d3ffab7e4f0fc3d9bd82690d4ccf2f90999d243192a8846a6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62A3 5200 bytes
font_01_sfnt_off00007458.bin
243355cbb5882c6c29b3b34ae8166b1fad41a664a60a1355299ad748de08b8ec		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7458 10556 bytes

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