Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fbe04f998d16eac…

MALICIOUS

PDF

44.8 KB Created: 2020-08-29 07:22:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: db9dcde5cb78aed6c790f20d3b7396a6 SHA-1: f37072c36a4587df0d21d4d8da30c92e58029825 SHA-256: 9fbe04f998d16eac627db91fc4410ee48653209d138bd2fb7b19d738cbfa302a
152 Risk Score

Malware Insights

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

The PDF document was flagged as malicious by a machine learning classifier and contains numerous embedded links. One of these links points to a known malicious redirector, ttraff.com, which is likely used to distribute further malware or phishing content. The document also exhibits characteristics of a PDF link farm, with many links pointing to external PDF files hosted on platforms like Shopify, suggesting an attempt to manipulate search engine results or distribute content through a large number of URLs.

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.com/wix?keyword=steve+jobs+pelicula+resumen
    • https://cdn.shopify.com/s/files/1/0431/3609/0267/files/99262858814.pdf
    • https://cdn.shopify.com/s/files/1/0439/6823/3630/files/ganusabinugezitipef.pdf
    • https://cdn.shopify.com/s/files/1/0433/9249/9877/files/game_of_thrones_trke_dublaj_1_sezon.pdf
    • https://static.usrfiles.com/ugd/b8c837_9de39514f661457f85d44fcf7b7d49b6.pdf
    • https://static.usrfiles.com/ugd/b8c837_885c92d5ba4a4cb8bff8f0cc4e663f9c.pdf
    • https://static.usrfiles.com/ugd/b8c837_3b4f91e2e1204f478d610ccfe9215586.pdf
    • https://static.usrfiles.com/ugd/b8c837_976822f605494c2280f25cbafcfbd61d.pdf
    • https://cdn.shopify.com/s/files/1/0430/4856/6941/files/24605657560.pdf
    • https://cdn.shopify.com/s/files/1/0434/0698/3333/files/lerepozujadudawatana.pdf
    • https://cdn.shopify.com/s/files/1/0459/1733/9797/files/55428388083.pdf
    • https://cdn.shopify.com/s/files/1/0431/0777/8711/files/19632605243.pdf
    • https://cdn.shopify.com/s/files/1/0433/5904/3749/files/56086382615.pdf
    • https://static.usrfiles.com/ugd/b8c837_ba81411a5788433eb5a317c500da141c.pdf
    • https://static.usrfiles.com/ugd/b8c837_44daba66323c4a78a8b07fbff4361a66.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_off00006445.bin
336bac691f624b5af4d4b61979e064341a4dc20ebfbd6aabffe81bedf7eae8c7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6445 5340 bytes
font_01_sfnt_off0000765c.bin
79326bb3e5315ac142209b706ded15d05a83352824b1f8bbacee64da53a58362		 pdf-font-stream PDF embedded font (sfnt) at offset 0x765C 9924 bytes
font_02_sfnt_off00009831.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9831 4324 bytes

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