Malicious PDF — malware analysis report

Static analysis result for SHA-256 df3a9011dbf3d247…

MALICIOUS

PDF

37.7 KB Created: 2020-08-17 01:13:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3642d4b550ac40e0e160daae3419c660 SHA-1: d8a535751e5e94e8f4a763e4e38fb64e4270e81a SHA-256: df3a9011dbf3d24717d9b73a717ab82563ef7ce5803e8728e878f479bdf8b9a0
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a significant number of external links, many of which are hosted on Shopify and appear to form a link farm. One of these links, 'https://ttraff.cc/pify?keyword=terrible+things+allegory+pdf', is identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The primary attack pattern involves luring users to click on these links, which likely lead to malicious content or further compromise.

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=terrible+things+allegory+pdf
    • http://files.barbaralyons.net/uploads/1/3/1/1/131164114/7040810.pdf
    • http://files.aspervalley.com/uploads/1/3/1/4/131437061/ef9211320d.pdf
    • http://files.lvmphotoshuntingtonwv.com/uploads/1/3/0/9/130969818/4954695.pdf
    • http://lumasazud.hycartstudio.com/uploads/1/3/1/4/131437515/aae5af43b.pdf
    • http://pitoret.nileswesttheatre.com/uploads/1/3/0/8/130874043/sijinuwikiwefijajaki.pdf
    • https://cdn.shopify.com/s/files/1/0439/3988/9310/files/askep_dermatitis_atopik.pdf
    • https://cdn.shopify.com/s/files/1/0436/0595/0626/files/ganadubebupefi.pdf
    • https://cdn.shopify.com/s/files/1/0429/4829/6863/files/pay_stub_maker.pdf
    • https://cdn.shopify.com/s/files/1/0434/2035/2677/files/7501354311.pdf
    • https://cdn.shopify.com/s/files/1/0437/7346/0641/files/52898117021.pdf
    • https://cdn.shopify.com/s/files/1/0432/6883/3436/files/bisection_method_notes.pdf
    • https://cdn.shopify.com/s/files/1/0430/7966/3765/files/89723656640.pdf
    • https://cdn.shopify.com/s/files/1/0433/1618/3205/files/thoughts_become_things.pdf
    • https://cdn.shopify.com/s/files/1/0432/3475/4728/files/27036903254.pdf
    • https://cdn.shopify.com/s/files/1/0432/4596/1383/files/27797927397.pdf
    • https://cdn.shopify.com/s/files/1/0431/2052/5469/files/46266688325.pdf
    • https://cdn.shopify.com/s/files/1/0431/7184/0161/files/junowojozekipema.pdf
    • https://cdn.shopify.com/s/files/1/0428/5107/4214/files/94244732725.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000568a.bin
cdc126e6db575037f9026546f86ff6b643133ec35ab6101831d84fc6258384b4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x568A 5492 bytes
font_01_sfnt_off0000692b.bin
821a60dc9f652bf1f872f6601bc8de7c471a767209df19ea1da00f7eb6a01473		 pdf-font-stream PDF embedded font (sfnt) at offset 0x692B 9548 bytes

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