Malicious PDF — malware analysis report

Static analysis result for SHA-256 a55b21c1c2344791…

MALICIOUS

PDF

52.9 KB Created: 2020-08-04 21:23:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 172ff123b67c9055d70135badec00108 SHA-1: 0274522df90ba55a47463bb5481ca4ced6bbfe09 SHA-256: a55b21c1c234479185c530d796a5083d91530febe2a6556e872b88beea532ed0
152 Risk Score

Malware Insights

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

The PDF contains embedded links that point to a redirector URL, which is a common tactic for phishing or malware delivery. The document body, though heavily obfuscated, contains text related to tax forms ('Steuerklasse ändern formular nrw pdf'), suggesting a lure. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' directly indicates malicious intent via the ttraff.com URL. The presence of numerous other PDF links, as noted by 'PDF_SEO_LINK_FARM', further supports a campaign distributing malicious content.

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.com/pify?keyword=steuerklasse+%25C3%25A4ndern+formular+nrw+pdf
    • http://files.brushandbranch.co/uploads/1/3/0/7/130740344/2297158.pdf
    • http://files.cglewis.com/uploads/1/3/0/7/130776594/3c6fcfc5e818452.pdf
    • http://files.bronxpartyhall.com/uploads/1/3/1/3/131379306/mofiriwoxema.pdf
    • http://files.alittlelessbacon.com/uploads/1/3/1/6/131606631/bd9fbc445.pdf
    • https://cdn.shopify.com/s/files/1/0438/9886/3771/files/matat.pdf
    • https://cdn.shopify.com/s/files/1/0437/1814/8261/files/baxuniwupopajum.pdf
    • https://cdn.shopify.com/s/files/1/0430/0954/0257/files/sexupu.pdf
    • https://cdn.shopify.com/s/files/1/0432/7541/9798/files/vasugaxexiviwov.pdf
    • https://cdn.shopify.com/s/files/1/0435/2563/6248/files/23186026526.pdf
    • https://cdn.shopify.com/s/files/1/0437/1673/9222/files/8074450776.pdf
    • https://cdn.shopify.com/s/files/1/0440/7027/3174/files/nelobo.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/8917749958.pdf
    • https://cdn.shopify.com/s/files/1/0434/3077/2902/files/brisbane_flood_map_1974.pdf
    • https://cdn.shopify.com/s/files/1/0429/9302/5183/files/css_box-_shadow.pdf
    • https://cdn.shopify.com/s/files/1/0429/2929/1427/files/pukexasiwaki.pdf
    • https://cdn.shopify.com/s/files/1/0430/7828/7513/files/luvevetadilubinojaxalumad.pdf
    • https://cdn.shopify.com/s/files/1/0428/2161/5775/files/17729352277.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_off00007c82.bin
112d5b830ec304840c9b8f7707fc68e56db44ad1c6621a6c2cd7821111013055		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C82 5516 bytes
font_01_sfnt_off00008eaa.bin
cbae0f4ea067ea9fac14020fa63b41e25a095a0e6cc85992c32245abe96fdb2c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8EAA 11924 bytes
font_02_sfnt_off0000b5dd.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB5DD 4324 bytes

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