Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa17b96ca4ceb0a5…

MALICIOUS

PDF

38.4 KB Created: 2020-09-04 22:01:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 12bbc3f8f2e8c03749f63620c47a1331 SHA-1: b781e55b5c4efe61e7b3d26d33fa4ee418c1bddc SHA-256: aa17b96ca4ceb0a557018a864d385899d1db56c1c51545a6b322666ba04188e9
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a link to a known malicious redirector, ttraff.me, which is likely intended to lead the user to a malicious site. The document body, though heavily obfuscated, contains the same URL and references 'phrasal verbs go exercises with answers', suggesting a lure. The presence of numerous links to shopify.com PDFs, while benign themselves, indicates a link farm strategy. The ML classifier strongly flagged this PDF as malicious.

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.me/pify?keyword=phrasal+verbs+go+exercises+with+answers
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/10809735118.pdf
    • https://cdn.shopify.com/s/files/1/0439/1036/5339/files/23418621557.pdf
    • https://cdn.shopify.com/s/files/1/0464/1715/0120/files/metodo_basico_de_trabajo_social.pdf
    • https://cdn.shopify.com/s/files/1/0431/5473/5264/files/83697046661.pdf
    • https://cdn.shopify.com/s/files/1/0432/7469/8912/files/26099942902.pdf
    • https://cdn.shopify.com/s/files/1/0431/8081/8581/files/64459518444.pdf
    • https://cdn.shopify.com/s/files/1/0433/9915/1768/files/20526756103.pdf
    • https://cdn.shopify.com/s/files/1/0433/4728/0026/files/1582672217.pdf
    • https://cdn.shopify.com/s/files/1/0434/0128/1701/files/fnma_guidelines_future_income.pdf
    • https://cdn.shopify.com/s/files/1/0432/8279/2606/files/75453298119.pdf
    • https://cdn.shopify.com/s/files/1/0454/4200/7190/files/messenger_cleaner_free.pdf
    • https://cdn.shopify.com/s/files/1/0464/7246/2486/files/49748514102.pdf
    • https://static.usrfiles.com/ugd/a31856_0430d550a4854cf7b3e86522414f842f.pdf
    • https://static.usrfiles.com/ugd/ea2f88_bf737536fa8b4420b3a0edd0d02e8f0a.pdf
    • https://static.usrfiles.com/ugd/f0e51d_a5cf054060f3462c894ed8ac9fc2082b.pdf
    • https://static.usrfiles.com/ugd/136d3d_a3d3bf173bd441a8a17d69a271266eac.pdf
    • https://static.usrfiles.com/ugd/6260fe_7a5226aab73b47f49019bf64da698d8b.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_off000056c6.bin
6868fb1aac24c580217b26ce67ad808bf50eeeaefec9192c5f55172d337a6783		 pdf-font-stream PDF embedded font (sfnt) at offset 0x56C6 5420 bytes
font_01_sfnt_off0000694c.bin
c2adb0e5be7ef3621bc5d4865b3568938522f01c1f47bffac32a2837422d4ca4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x694C 10332 bytes

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