Malicious PDF — malware analysis report

Static analysis result for SHA-256 511c5c3de34d915c…

MALICIOUS

PDF

51.3 KB Created: 2020-08-22 05:55:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2b188f88f76a121b3c5a4105258b1c65 SHA-1: 8af2d9cdac7d94908b5f519fbaa21cedd1724da3 SHA-256: 511c5c3de34d915c234939cef23257eeb159fb016f899b2df4738d3d4c59e4d7
154 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, pointing to 'https://ttraff.ru/pify?keyword=europa+universalis+4+modding+guide'. It also exhibits characteristics of a PDF link farm, with numerous embedded URLs, many hosted on cdn.shopify.com. The document body, though partially corrupted, includes the same malicious URL and appears to be a lure for a 'Europa universalis 4 modding guide'. The ML classifier strongly flagged this PDF as malicious.

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=europa+universalis+4+modding+guide
    • http://turas.elynyd.com/uploads/1/3/1/4/131438448/4338179.pdf
    • https://cdn.shopify.com/s/files/1/0430/0816/3993/files/96179023027.pdf
    • https://cdn.shopify.com/s/files/1/0433/7270/7990/files/manufacturing_case_study_examples.pdf
    • https://cdn.shopify.com/s/files/1/0433/7437/9157/files/advanced_medical_life_support_download.pdf
    • https://cdn.shopify.com/s/files/1/0436/9268/7513/files/pakistani_movie_bandish_songs_free.pdf
    • https://cdn.shopify.com/s/files/1/0433/3672/8726/files/54669419869.pdf
    • https://cdn.shopify.com/s/files/1/0433/9492/4694/files/north_iceland_tourist_guide.pdf
    • https://cdn.shopify.com/s/files/1/0437/8578/1397/files/makefason.pdf
    • https://cdn.shopify.com/s/files/1/0435/1095/6196/files/control_of_typhoid_fever.pdf
    • https://cdn.shopify.com/s/files/1/0433/6818/6024/files/hyperuricemia_treatment_guidelines.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_off00008bfa.bin
e8ead91febce1e431e1bc644bf27fba4ae6a1a4b1582fe405af87e72d4d72b63		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8BFA 5384 bytes
font_01_sfnt_off00009e46.bin
b58b1192d68d03321c4e544a31873f0a3226b745fd1af21b49b93857309c587f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9E46 10128 bytes

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