Malicious PDF — malware analysis report

Static analysis result for SHA-256 90b5950cbbbf0543…

MALICIOUS

PDF

43.0 KB Created: 2020-08-06 00:41:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d85cb21838abbbfdebf38e8e7fe45ec2 SHA-1: 2b52b88c481a3a968785320372c90b3b65a0c0d6 SHA-256: 90b5950cbbbf05434e5360ba1ea7f05ac06f1376716b0d46a2b88c8aea62cdbf
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a link farm hosted on Shopify. One of these links, 'https://ttraff.ru/pify?keyword=test+czasy+tera%25C5%25BAniejsze+angielski+pdf', is identified as a malicious redirector. The document body appears to be corrupted or obfuscated, but the presence of numerous links suggests an attempt to direct users to malicious content or to manipulate search engine results.

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=test+czasy+tera%25C5%25BAniejsze+angielski+pdf
    • http://files.coyotecreekbooks.com/uploads/1/3/2/7/132712266/5b6c8d68b.pdf
    • http://files.lptannettdesigns.com/uploads/1/3/1/6/131606453/e2436faf1fa8.pdf
    • http://files.fosteringtogethergc.com/uploads/1/3/0/7/130739510/a25d2e12ea1c6.pdf
    • http://files.kinobykimie.com/uploads/1/3/1/4/131454850/dizerovamud.pdf
    • http://files.naopuppet.com/uploads/1/3/1/1/131164431/kidivegeke.pdf
    • https://cdn.shopify.com/s/files/1/0431/8904/3358/files/reduliwigoro.pdf
    • https://cdn.shopify.com/s/files/1/0436/7079/8489/files/11910127715.pdf
    • https://cdn.shopify.com/s/files/1/0432/5864/2600/files/pilozal.pdf
    • https://cdn.shopify.com/s/files/1/0431/7508/4193/files/94362649472.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/dobemajafapurotexujebo.pdf
    • https://cdn.shopify.com/s/files/1/0446/6117/8521/files/can_you_speed_up_edgenuity_videos.pdf
    • https://cdn.shopify.com/s/files/1/0435/1734/5944/files/nakebatuxolemazik.pdf
    • https://cdn.shopify.com/s/files/1/0440/6670/1477/files/approach_to_acute_abdominal_pain.pdf
    • https://cdn.shopify.com/s/files/1/0440/1473/1429/files/73193587726.pdf
    • https://cdn.shopify.com/s/files/1/0438/3470/4034/files/minecraft_1._14._2_patch_notes.pdf
    • https://cdn.shopify.com/s/files/1/0431/6246/8516/files/xoromufelazajeduwegakofed.pdf
    • https://cdn.shopify.com/s/files/1/0438/2133/4688/files/ninudabukav.pdf
    • https://cdn.shopify.com/s/files/1/0433/7840/9639/files/sixudowo.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_off00006505.bin
74e18f8c95402b8cf5b2cd0daa73da935e72fb642c952fa90365461109ef8f13		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6505 5636 bytes
font_01_sfnt_off0000784e.bin
9f8bb61a0446c0cdd4fd79781b165972c63cff3c1cfec07551ed82dd1399448d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x784E 11600 bytes

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