Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8655754798fc03f…

MALICIOUS

PDF

45.6 KB Created: 2020-08-17 05:12:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2f8e3909234468adbdbeaf4558e2d9b0 SHA-1: 44ff9cc7f895cf566f071f15b954ca45a6800ee9 SHA-256: d8655754798fc03f508e0ea276bb6bd164b8a983de98252ff0eb606253db08a0
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.ru/pify?keyword=plantronics+backbeat+fit+user+guide'. Additionally, it exhibits characteristics of a PDF link farm, with numerous external links, one of which is to 'https://cdn.shopify.com/s/files/1/0434/6327/8758/files/winter_solstice_rosamunde_pilcher.pdf'. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the malicious URL, suggesting a lure to a phishing or malware distribution site.

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=plantronics+backbeat+fit+user+guide
    • http://files.operationimagination.com/uploads/1/3/0/8/130874257/limopaku.pdf
    • http://files.rccummins.com/uploads/1/3/0/7/130775382/472e9d87ed0993.pdf
    • http://files.demirandaguitar.com/uploads/1/3/1/8/131871690/fokodibavuf_zogovisum.pdf
    • http://files.theoxytocinproject.com/uploads/1/3/0/7/130740389/vedipe.pdf
    • http://seduvikof.vacationhostcoach.com/uploads/1/3/1/4/131438641/6638080.pdf
    • http://files.demirandaguitar.com/uploads/1/3/1/8/131871690/foko
    • https://cdn.shopify.com/s/files/1/0434/6327/8758/files/winter_solstice_rosamunde_pilcher.pdf
    • https://cdn.shopify.com/s/files/1/0434/1448/7207/files/6179013088.pdf
    • https://cdn.shopify.com/s/files/1/0431/1485/6610/files/limidovujaxenirix.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/31052941417.pdf
    • https://cdn.shopify.com/s/files/1/0431/0165/1101/files/23792024691.pdf
    • https://cdn.shopify.com/s/files/1/0431/3861/3399/files/votobozefefajoruweze.pdf
    • https://cdn.shopify.com/s/files/1/0431/4349/5841/files/55505483759.pdf
    • https://cdn.shopify.com/s/files/1/0430/8012/2532/files/75789129912.pdf
    • https://cdn.shopify.com/s/files/1/0439/8976/2206/files/printable_total_gym_exercise_chart.pdf
    • https://cdn.shopify.com/s/files/1/0435/2717/6344/files/36189920861.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_off00006978.bin
fce25b2a37194225b53cdb1069030cdee0b5c324287ca33592e5a9cb3b4bc7d9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6978 5396 bytes
font_01_sfnt_off00007bc9.bin
6d2a3a16cc464ce72cf05976c7f96a31c93af2202e0dc760c37a694345e222ee		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7BC9 1800 bytes
font_02_sfnt_off00008459.bin
896e2fe6dbbcc399672d59aa76fa97ee77bb7fe8e0433678da0e268be595cc61		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8459 10688 bytes

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