Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbdef270eb6c6e27…

MALICIOUS

PDF

50.8 KB Created: 2020-08-03 08:55:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f57e0df9a053e6d6a64987128ea02148 SHA-1: a86744a88976b1a42d777cd4a9d79f4914b44d5c SHA-256: cbdef270eb6c6e275ccaadca45846287f6acc2ad994b4a897d66542e80b07619
152 Risk Score

Malware Insights

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

The PDF file contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically 'ttraff.com'. Additionally, it exhibits characteristics of a PDF link farm, hosting numerous external PDF files, many of which are hosted on Shopify. The ML classifier also strongly indicated maliciousness. The primary attack pattern appears to be the distribution of malicious links, potentially leading to further compromise or SEO manipulation.

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/pify?keyword=javascript+reverse+array
    • http://files.capitolsteamandclean.com/uploads/1/3/0/7/130776487/93d660033606c.pdf
    • http://files.iminvestors.com/uploads/1/3/1/3/131384462/06c309e.pdf
    • http://files.papyrology.org/uploads/1/3/0/7/130776757/rimolexupidusep_latef.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/96951977507.pdf
    • https://cdn.shopify.com/s/files/1/0441/2358/6712/files/1098t_uc_davis.pdf
    • https://cdn.shopify.com/s/files/1/0439/0476/2011/files/jeketabomuj.pdf
    • https://cdn.shopify.com/s/files/1/0427/8065/5775/files/fodegubafunagawukenamasa.pdf
    • https://cdn.shopify.com/s/files/1/0434/8923/1014/files/wefexaluxufibaned.pdf
    • https://cdn.shopify.com/s/files/1/0438/3513/0018/files/nusuxojudefibejufet.pdf
    • https://cdn.shopify.com/s/files/1/0428/3056/1436/files/49532553479.pdf
    • https://cdn.shopify.com/s/files/1/0438/0783/4272/files/starbound_frackin_universe_server.pdf
    • https://cdn.shopify.com/s/files/1/0432/2630/0575/files/vaxitaboro.pdf
    • https://cdn.shopify.com/s/files/1/0433/9276/2017/files/10905554067.pdf
    • https://cdn.shopify.com/s/files/1/0432/7217/5781/files/66559692390.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006d61.bin
da1ea10b2d43f35dd47b1a2c3dd0f4290ac1fa945b6868899cf6aa799b154ccb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D61 4616 bytes
font_01_sfnt_off00007d21.bin
1353ec95c92aa3425d4afb8f7cab38d7cbf460488578001a5559dc3c582e7d21		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D21 3488 bytes
font_02_sfnt_off00008b21.bin
a80c0f3c1b99994614932802c98a82778e4f1c8951f218b6872fff17fa10ee9d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B21 11332 bytes
font_03_sfnt_off0000afc3.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAFC3 4324 bytes

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