Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9b59680393d61ec…

MALICIOUS

PDF

37.8 KB Created: 2020-08-09 11:20:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 12a50ec3dfac21407e45440aa01dc974 SHA-1: ad83ff0df4494e5e6a44bffa7d8093754300e65b SHA-256: a9b59680393d61ec19a57da2d7947a91c355aef3f18be9703fff4f799b24415f
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, including one pointing to a known malicious redirector. The document body, though heavily obfuscated, contains the URL 'https://ttraff.ru/pify?keyword=abnormal+psychology+pdf+textbook', suggesting a lure to download or view content related to 'abnormal psychology'. The presence of a large number of external PDF links, many hosted on Shopify, indicates a link farm intended to manipulate search engine results or distribute malicious content.

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=abnormal+psychology+pdf+textbook
    • http://files.historyunderground.us/uploads/1/3/0/8/130814594/pupomij-banojorugujeto.pdf
    • http://files.cwwdelta.com/uploads/1/3/2/6/132683137/8411927.pdf
    • http://files.rickkeyesmusiccaravan.com/uploads/1/3/0/8/130813732/reziwepujemoxirojem.pdf
    • http://files.ulientertains.com/uploads/1/3/1/1/131164122/jagotati.pdf
    • http://files.greetingscomrade.com/uploads/1/3/2/6/132681436/xavunejod.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/89377355024.pdf
    • https://cdn.shopify.com/s/files/1/0428/7679/7081/files/57928596761.pdf
    • https://cdn.shopify.com/s/files/1/0430/4856/6941/files/zupimagolafawuzufuku.pdf
    • https://cdn.shopify.com/s/files/1/0434/7294/5304/files/47260420664.pdf
    • https://cdn.shopify.com/s/files/1/0430/6799/8362/files/45455055973.pdf
    • https://cdn.shopify.com/s/files/1/0431/9218/9089/files/traduzione_amleto.pdf
    • https://cdn.shopify.com/s/files/1/0440/8714/8709/files/25571435594.pdf
    • https://cdn.shopify.com/s/files/1/0435/0840/0280/files/rigoxokonawederakekezu.pdf
    • https://cdn.shopify.com/s/files/1/0432/6493/4043/files/biwetukekofexibuxula.pdf
    • https://cdn.shopify.com/s/files/1/0436/5529/9237/files/57358274358.pdf
    • https://cdn.shopify.com/s/files/1/0432/7456/7843/files/tupubif.pdf
    • https://cdn.shopify.com/s/files/1/0437/1690/3080/files/79317596316.pdf
    • https://cdn.shopify.com/s/files/1/0433/9377/7827/files/28732412974.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_off00004975.bin
173fd2ffbd1ed064f09fc8671bf3564afdb5edb6c5d812bc91bda073f9549140		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4975 5672 bytes
font_01_sfnt_off00005c89.bin
afd6ec4287acda19a8803da7b6cbf1716cf3421bfe170af217a45edf475ff1a3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C89 9268 bytes
font_02_sfnt_off00007c1f.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C1F 4324 bytes

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