Malicious PDF — malware analysis report

Static analysis result for SHA-256 715b662e966d4aa2…

MALICIOUS

PDF

91.8 KB Created: 2020-08-07 17:39:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 610d6a2b59b52d39407d6e6c4dac2f79 SHA-1: b0889def945f5b33a9b54d6353eef308662b3312 SHA-256: 715b662e966d4aa262660968ad4cbad851c43cc9bf1f4d9963bcecb0653c6a8f
154 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by an ML classifier and contains a critical heuristic indicating it links to known malicious redirector infrastructure. Additionally, it features a large number of external PDF links, suggesting a link farm or content hosting strategy. The embedded URL points to a redirector that likely leads to further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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=ammocoete+larva+pdf
    • http://files.talkingaac.org/uploads/1/3/2/8/132814989/aa300.pdf
    • http://files.jovanmays.com/uploads/1/3/1/6/131606687/8438844.pdf
    • http://files.buddycushmanfineart.com/uploads/1/3/0/7/130776484/zetuxolariweke.pdf
    • http://files.obsessivecompulsivedetailing.com/uploads/1/3/1/3/131383943/1de206c9707.pdf
    • http://files.kathrynemyoung.com/uploads/1/3/1/0/131071076/porewuvofadaxa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0436/2141/7122/files/susizelim.pdf
    • https://cdn.shopify.com/s/files/1/0435/8399/6063/files/weginorobiladizewe.pdf
    • https://cdn.shopify.com/s/files/1/0437/7139/6257/files/nomenclature_of_benzene.pdf
    • https://cdn.shopify.com/s/files/1/0439/7439/4014/files/basic_components_of_air_conditioning_system.pdf
    • https://cdn.shopify.com/s/files/1/0430/3529/5905/files/6529125976.pdf
    • https://cdn.shopify.com/s/files/1/0428/8416/9894/files/bilevojigesifomativa.pdf
    • https://cdn.shopify.com/s/files/1/0433/6232/0536/files/54204205661.pdf
    • https://cdn.shopify.com/s/files/1/0430/7045/5957/files/payment_acknowledgement_letter.pdf
    • https://cdn.shopify.com/s/files/1/0432/2190/9662/files/natepebepefemimupepatet.pdf
    • https://cdn.shopify.com/s/files/1/0429/8794/6133/files/22121735134.pdf
    • https://cdn.shopify.com/s/files/1/0433/7467/4083/files/kojobipuluruvubeb.pdf
    • https://cdn.shopify.com/s/files/1/0436/4196/2649/files/kotepanukizipedopizope.pdf
    • https://cdn.shopify.com/s/files/1/0427/8226/1415/files/92431282918.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd71.bin
01b01b52c397a3145400d45de18ec25767792d683e9b5e39fd1dd34aa6fb59de		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD71 3760 bytes
font_01_sfnt_off00010ac8.bin
1322bcd8bc790ab266548527533445a51d0ccba6cbd750f18bba2cc4759090b4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10AC8 4804 bytes
font_02_sfnt_off00011b17.bin
d0242708a560573c479765b003d2a197f1cdf862168e50cdb318aff96325fd4e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11B17 1716 bytes
font_03_sfnt_off000123be.bin
2bc4796302519f397efadbd47abc47becd18c6b836bfd1007002a1ec1c6bd5db		 pdf-font-stream PDF embedded font (sfnt) at offset 0x123BE 14932 bytes
font_04_sfnt_off000152c3.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x152C3 4324 bytes

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