Malicious PDF — malware analysis report

Static analysis result for SHA-256 6146b593bf45df69…

MALICIOUS

PDF

39.0 KB Created: 2020-08-22 12:42:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e9d6ef8485466c534441a1edcfdef4d8 SHA-1: d4d98eef7d052b0024499eb1647b1782f3f0bd15 SHA-256: 6146b593bf45df69d7422689e0bc764de3098ff2e3e8fc631ece170fef1d5670
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically a URL related to 'Centrelink report earnings phone number'. It also exhibits characteristics of a PDF link farm, with numerous embedded links, many pointing to Shopify-hosted PDFs. The ML classifier strongly flagged this PDF as malicious. The primary attack vector appears to be social engineering, directing users to potentially harmful content via the malicious URL.

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.cc/pify?keyword=centrelink+report+earnings+phone+number
    • http://files.tradewindsadriaticllc.com/uploads/1/3/1/1/131164310/disipor_fenezuwirogete_jetebov_zevakipipe.pdf
    • http://files.studiothinking.org/uploads/1/3/1/8/131856009/f9e15e2.pdf
    • http://wiziw.mattjacobsphotography.net/uploads/1/3/0/9/130969352/4085048.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0438/5603/5990/files/munerukixiruxedotas.pdf
    • https://cdn.shopify.com/s/files/1/0438/9945/3608/files/dofegumisononokufaxi.pdf
    • https://cdn.shopify.com/s/files/1/0430/0688/6051/files/sample_coaching_log_template.pdf
    • https://cdn.shopify.com/s/files/1/0432/5064/7202/files/nupepebebizoxa.pdf
    • https://cdn.shopify.com/s/files/1/0428/4969/7959/files/nulixovemefeluda.pdf
    • https://cdn.shopify.com/s/files/1/0430/4656/8098/files/49100271373.pdf
    • https://cdn.shopify.com/s/files/1/0433/1307/0238/files/lazajixaneverir.pdf
    • https://cdn.shopify.com/s/files/1/0429/4977/1430/files/twilight_life_and_death_download_free.pdf
    • https://cdn.shopify.com/s/files/1/0434/5020/4316/files/56786323055.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004cbc.bin
559288dc094c677711de9589eb265c29ea4c659b7b994174ec70ffc46d474fd4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4CBC 5340 bytes
font_01_sfnt_off00005eb3.bin
ff9a028c5e68ce1f9d0ee9604c1b2cf2784bda92de03379e28b5da42e110852e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5EB3 10040 bytes
font_02_sfnt_off00008110.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8110 4324 bytes

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