Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0f8d83dbf901762…

MALICIOUS

PDF

40.4 KB Created: 2020-08-14 17:36:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2cfe443f2e89aac825a0c99ffcf31648 SHA-1: de5d34b48e8efd3e5da61700deaa1a666994d1a9 SHA-256: b0f8d83dbf901762973ef719c9d7066051d16229a20799e3fab75b72fac4c55f
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.ru, which is disguised as a certificate design template. The document also functions as a link farm, containing numerous external links, many of which point to Shopify domains. The ML classifier strongly indicated maliciousness, and the PDF structure suggests an attempt to lure users to malicious infrastructure.

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=certificate+design+templates+powerpoint
    • http://lanesu.synergistic-business-marketing.com/uploads/1/3/1/6/131636725/zafasebesapetigazi.pdf
    • http://lozepit.shazzad.net/uploads/1/3/0/8/130874359/a8c0d6.pdf
    • http://siwid.shschoir.org/uploads/1/3/0/7/130775350/63b5bb8d7eadbd8.pdf
    • https://cdn.shopify.com/s/files/1/0433/9128/7452/files/9657964621.pdf
    • https://cdn.shopify.com/s/files/1/0440/8007/0821/files/geramov.pdf
    • https://cdn.shopify.com/s/files/1/0440/1650/0886/files/myanmar_bible_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/3892/4181/files/xemejesidogew.pdf
    • https://cdn.shopify.com/s/files/1/0433/5586/5242/files/53373240812.pdf
    • https://cdn.shopify.com/s/files/1/0436/6155/7913/files/73765802364.pdf
    • https://cdn.shopify.com/s/files/1/0429/6821/9799/files/lononuzawopebuwibosa.pdf
    • https://cdn.shopify.com/s/files/1/0433/0697/5382/files/54570844225.pdf
    • https://cdn.shopify.com/s/files/1/0428/0123/4076/files/40720942288.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_off000060bf.bin
5aee720276dc20206f0ff22d491701633349bcc48b346f09970f452bb1a04b97		 pdf-font-stream PDF embedded font (sfnt) at offset 0x60BF 5472 bytes
font_01_sfnt_off00007352.bin
5d7b01644d28fa819c7e75a44a82008922e34efe76fd3a2aedb97c675f85d32f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7352 9804 bytes

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