Malicious PDF — malware analysis report

Static analysis result for SHA-256 892b6971a2f8be52…

MALICIOUS

PDF

37.1 KB Created: 2020-08-06 04:42:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f87af23c269c1f338d81e93ee5c59cd3 SHA-1: feeb1ed0b9979fede43ea22f20e0f241b06bf213 SHA-256: 892b6971a2f8be52ac931037187eee61374385a01d428b7e43f6aea7cd394c91
152 Risk Score

Malware Insights

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

The PDF contains a link farm and a critical redirector link to 'ttraff.ru', indicating a malicious redirection attempt. The ML classifier also strongly flagged this PDF as malicious. The presence of numerous external PDF links, many hosted on Shopify, suggests a tactic to obscure the ultimate malicious destination and potentially leverage SEO for distribution. The document body contains garbled text and a URL that appears to be the primary malicious entry point.

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=modul+akuntansi+sektor+publik+pdf
    • http://files.chellesparklycorner.com/uploads/1/3/0/9/130969653/5667759.pdf
    • http://feropakam.nashmortgage.com/uploads/1/3/0/7/130776046/nezovedutewoxe-nopiponidim-pexiriz.pdf
    • http://files.lighthousemontgomery.org/uploads/1/3/1/4/131437702/mozuwurep-lilaponitasulu-fokidogibuz.pdf
    • http://files.dcalfine.com/uploads/1/3/1/3/131384306/pemurukemakakipoma.pdf
    • https://cdn.shopify.com/s/files/1/0437/3138/6529/files/mepilafu.pdf
    • https://cdn.shopify.com/s/files/1/0432/4160/3239/files/zoology_book_download.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/46676539889.pdf
    • https://cdn.shopify.com/s/files/1/0437/7070/8125/files/beckett_price_guide_free.pdf
    • https://cdn.shopify.com/s/files/1/0431/3173/2122/files/bulut.pdf
    • https://cdn.shopify.com/s/files/1/0438/4351/8614/files/96568277184.pdf
    • https://cdn.shopify.com/s/files/1/0431/8475/0747/files/sonituziverobugevofixadu.pdf
    • https://cdn.shopify.com/s/files/1/0437/7178/9470/files/30479621622.pdf
    • https://cdn.shopify.com/s/files/1/0434/3362/3708/files/robedovenubomewasunexoxa.pdf
    • https://cdn.shopify.com/s/files/1/0434/1887/8104/files/30901821721.pdf
    • https://cdn.shopify.com/s/files/1/0439/2045/7883/files/walt_disney_animation_studios_the_archive_series_story.pdf
    • https://cdn.shopify.com/s/files/1/0433/1339/7924/files/61835951386.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_off00005465.bin
96b11d98ec1c072f16c508884e65a59cd01b3546cd8dbc135db354ab10e16b76		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5465 5244 bytes
font_01_sfnt_off0000664e.bin
e718e9a9f8944f6a0f00d91f6ab1a751e57a138c4231c963938c90e90c288af5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x664E 9748 bytes

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