Malicious PDF — malware analysis report

Static analysis result for SHA-256 557ee8f34c33805d…

MALICIOUS

PDF

50.2 KB Created: 2020-08-02 08:17:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c56f94a8e3c3a0c9ce40593c9b3d2d87 SHA-1: acebf69a731ca92c4c7b165fd2cbb858d37d0c6a SHA-256: 557ee8f34c33805d608f480788d1d158ea750086d046f2302278f36ae184c934
152 Risk Score

Malware Insights

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

The PDF file was flagged by multiple critical heuristics for containing malicious redirector links and a large link farm. The ML classifier also strongly indicated maliciousness. The primary malicious IOC is the redirector URL 'https://ttraff.cc/pify?keyword=cyanogen+13+nexus+5', which likely leads to further malicious content or phishing pages. The document body contains a mix of seemingly random text and URLs, reinforcing the SEO spam or redirection attack pattern.

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=cyanogen+13+nexus+5
    • http://files.holisticvoicecoach.com/uploads/1/3/2/6/132682563/6907149.pdf
    • http://files.rcccamp.org/uploads/1/3/1/3/131380625/3704954.pdf
    • http://files.generationrestaurantsupply.com/uploads/1/3/0/7/130740292/4149095.pdf
    • http://files.epvballoons.com/uploads/1/3/0/7/130739309/radotonu-jedolofi-rixupojulir.pdf
    • https://cdn.shopify.com/s/files/1/0437/6100/8791/files/binun.pdf
    • https://cdn.shopify.com/s/files/1/0432/1322/6139/files/49393183417.pdf
    • https://cdn.shopify.com/s/files/1/0432/7122/5494/files/45777454572.pdf
    • https://cdn.shopify.com/s/files/1/0432/7420/7387/files/14304434464.pdf
    • https://cdn.shopify.com/s/files/1/0434/0829/4044/files/15768054751.pdf
    • https://cdn.shopify.com/s/files/1/0432/1509/3917/files/todesusatexofesenit.pdf
    • https://cdn.shopify.com/s/files/1/0429/3437/0470/files/89888880961.pdf
    • https://cdn.shopify.com/s/files/1/0427/4041/6678/files/18835487945.pdf
    • https://cdn.shopify.com/s/files/1/0439/1164/3304/files/63410077638.pdf
    • https://cdn.shopify.com/s/files/1/0432/5556/2398/files/5013167058.pdf
    • https://cdn.shopify.com/s/files/1/0438/8985/2568/files/fepuwukuleludo.pdf
    • https://cdn.shopify.com/s/files/1/0430/3906/4225/files/87376384109.pdf
    • https://cdn.shopify.com/s/files/1/0427/7328/2983/files/kakijejorarut.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_off00007b13.bin
a31a4259200a7448997bd26fcebf9c6a30b23ed76d411b6c233f8663ac87da30		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B13 5140 bytes
font_01_sfnt_off00008cb5.bin
daad3f347a4f42f432ee9983e619a7c063e36761dba5934b469418034847e28e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8CB5 1800 bytes
font_02_sfnt_off00009543.bin
69eb92b8a1121be4c79e00fc888b8d6247e8a576f56c30b230f9ee41a4bf3dd5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9543 11064 bytes

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