Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0c5b45e935396e7…

MALICIOUS

PDF

50.1 KB Created: 2020-08-08 22:39:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0f85b0357ca7d2b130d891de4c6b7778 SHA-1: b84c7ba91029f954f814a970ade29a4f7ccdf0c2 SHA-256: d0c5b45e935396e72b07fd5db82f9e43e611de88ca801579d51c011b620e7a64
152 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded links, constituting a link farm. One of these links, 'https://ttraff.ru/pify?keyword=transistor+bd139+smd+pdf', redirects to known malicious infrastructure. The ML classifier also strongly indicated maliciousness. The document body appears to be malformed or heavily obfuscated, but the presence of numerous external links suggests a social engineering or redirection-based attack.

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=transistor+bd139+smd+pdf
    • http://nuram.jennifernomad.com/uploads/1/3/1/4/131408899/4730531.pdf
    • http://files.psychologycenterofaustin.com/uploads/1/3/0/8/130873795/1249532.pdf
    • http://files.ukopedestal.com/uploads/1/3/0/7/130739043/49b6075e805c9.pdf
    • http://files.artisanoutdoorok.com/uploads/1/3/1/3/131379477/fefakolazolojage.pdf
    • http://files.thedaintyhanger.com/uploads/1/3/0/7/130739107/2962830.pdf
    • https://cdn.shopify.com/s/files/1/0429/9181/2767/files/sepekabulixut.pdf
    • https://cdn.shopify.com/s/files/1/0433/3522/1403/files/how_to_get_more_emotes_on_twitch.pdf
    • https://cdn.shopify.com/s/files/1/0433/6658/0382/files/jajafun.pdf
    • https://cdn.shopify.com/s/files/1/0431/4886/9786/files/tivivofujidetilasuwikefu.pdf
    • https://cdn.shopify.com/s/files/1/0429/5720/9753/files/changes_an_anthology_of_short_stories_by_b_walter.pdf
    • https://cdn.shopify.com/s/files/1/0432/5448/1058/files/pupewonolejusasa.pdf
    • https://cdn.shopify.com/s/files/1/0435/4228/2399/files/62965648061.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/68905528383.pdf
    • https://cdn.shopify.com/s/files/1/0437/1434/7160/files/22604521880.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/nakawefefaf.pdf
    • https://cdn.shopify.com/s/files/1/0429/1146/5638/files/rilasaxajuzu.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_off00005e85.bin
19e3d715bfc7ef96dd8273616134172da697b2e136542f84288a2738077ff1d3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E85 5616 bytes
font_01_sfnt_off0000717b.bin
baf062489c23b0bc42dc2d4a8b5bccd00c435fdf0a808bb9da486c0d82adba24		 pdf-font-stream PDF embedded font (sfnt) at offset 0x717B 17404 bytes
font_02_sfnt_off0000a503.bin
249651805b0a8f5b4743f17da7e3943b18be49f9c75a96c0f18a2f62b87e55bb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA503 16084 bytes

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