Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f486787af315def…

MALICIOUS

PDF

47.6 KB Created: 2020-07-26 06:55:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1f72a7b11e2a42b2bf620c81348b17b2 SHA-1: c96a6a6a08a37b30157ff54e18e56467b6319b4b SHA-256: 3f486787af315def3874af3036c7b30733cd7ad6d9535d76ddebe2c10932c665
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1059.001 PowerShell

The PDF contains a large number of embedded links, many pointing to Shopify domains with seemingly random filenames, suggesting a link farm for SEO manipulation. One critical heuristic identified a link to a known malicious redirector at 'ttraff.ru'. The ML classifier also strongly flagged this PDF as malicious. The document body appears to be corrupted or heavily obfuscated, preventing a clear understanding of its intended lure, but the presence of numerous links and the malicious redirector strongly indicate a malicious intent, likely to drive traffic to malicious sites or distribute further malware.

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=the+electromagnetic+spectrum+worksheet+answers+edhelper
    • http://files.westhartselle.com/uploads/1/3/0/8/130814680/zasewasazubasibu.pdf
    • http://files.personalhibachichef.com/uploads/1/3/1/8/131872298/aab0c5cebb17b.pdf
    • http://files.friederikeluisekelle.com/uploads/1/3/1/6/131606179/fawiw_nodisur_jaroboj.pdf
    • https://cdn.shopify.com/s/files/1/0431/9966/0194/files/81637944180.pdf
    • https://cdn.shopify.com/s/files/1/0437/8725/5970/files/wugemazi.pdf
    • https://cdn.shopify.com/s/files/1/0437/3712/0933/files/rinesitupiwobej.pdf
    • https://cdn.shopify.com/s/files/1/0430/3850/7169/files/95227401388.pdf
    • https://cdn.shopify.com/s/files/1/0434/4233/9992/files/nudemu.pdf
    • https://cdn.shopify.com/s/files/1/0435/3510/6200/files/26808155547.pdf
    • https://cdn.shopify.com/s/files/1/0432/0201/9487/files/48107094376.pdf
    • https://cdn.shopify.com/s/files/1/0437/7932/6110/files/nudafo.pdf
    • https://cdn.shopify.com/s/files/1/0437/7106/8577/files/ginaporunadubofisisige.pdf
    • https://cdn.shopify.com/s/files/1/0427/8714/3839/files/68690323435.pdf
    • https://cdn.shopify.com/s/files/1/0432/2977/3982/files/85302500373.pdf
    • https://cdn.shopify.com/s/files/1/0438/7766/2875/files/saloruwopapit.pdf
    • https://cdn.shopify.com/s/files/1/0429/8627/4967/files/rebixisidisat.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007ab6.bin
2b2e310819c788c05990a88bee7a6b4d9d2e3b5dbafd17f14d25b123953b22ee		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7AB6 5472 bytes
font_01_sfnt_off00008d34.bin
98de627a0fcbba26a0d17a931bebbbc7dbfc33335838b3b36512ee76a0fef832		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8D34 10408 bytes

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