Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb4322c1c7a460e5…

MALICIOUS

PDF

39.3 KB Created: 2020-08-20 20:59:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a78449525e9391fe88398a36d54da535 SHA-1: 2d513b3ec6820bebd23e1bc9d67ffd6285fee4c3 SHA-256: fb4322c1c7a460e50efd32e7f1973a74acf36f9b47e40353364a1361e8d42f28
150 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with the primary link directing to a known malicious redirector. The document body, though partially corrupted, contains text related to 'gba emulator roms for android' and the malicious URL, suggesting a lure to a phishing or malware distribution site. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=gba+emulator+roms+for+android
    • http://files.lightonplaza.com/uploads/1/3/0/7/130775747/5855531.pdf
    • https://cdn.shopify.com/s/files/1/0433/9014/0583/files/19982351391.pdf
    • https://cdn.shopify.com/s/files/1/0428/2348/3548/files/51416252927.pdf
    • https://cdn.shopify.com/s/files/1/0437/3577/7445/files/best_guitar_books_for_self_teaching.pdf
    • https://cdn.shopify.com/s/files/1/0429/7926/2623/files/58109124671.pdf
    • https://cdn.shopify.com/s/files/1/0429/3420/6631/files/63533074997.pdf
    • https://cdn.shopify.com/s/files/1/0431/4300/4322/files/bosud.pdf
    • https://cdn.shopify.com/s/files/1/0434/3444/2917/files/microsoft_leap_resume.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/nenipuwewof.pdf
    • https://cdn.shopify.com/s/files/1/0435/2602/9463/files/jijinixigawigekulageze.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_off00005bd4.bin
a1aa7ee2184787a2f9b503304e6d08945f5d9b4fe9d316a479a78a9029b70620		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5BD4 5224 bytes
font_01_sfnt_off00006d8d.bin
a4ac8035cec61dbf25ca723af6240865f5893839268921ac3f64a5c43d253d71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D8D 10388 bytes

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