Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0e257291d8f5172…

MALICIOUS

PDF

47.0 KB Created: 2020-08-04 00:29:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e04bedc1e63f0704dec621bbe5b679e8 SHA-1: 70369d77498110fc90ab50d906e874b0d153bd70 SHA-256: b0e257291d8f51721003f80dd15265a229e9f5e5788f782446b038d93ca12fb8
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which are part of a link farm hosted on Shopify. One URL, https://ttraff.ru/wb?keyword=quadrilaterals%20grade%209%20cbse%20worksheets, is flagged as a malicious redirector. The document body, though heavily obfuscated, also contains this URL, suggesting the primary purpose is to redirect users to potentially 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/wb?keyword=quadrilaterals%20grade%209%20cbse%20worksheets
    • http://files.cheyenne-janas.com/uploads/1/3/1/1/131163841/c5e0ec3fdc2.pdf
    • http://files.anguezomo-bikoro.com/uploads/1/3/1/3/131384432/2edfcbe.pdf
    • http://files.yoansewingstudio.com/uploads/1/3/1/4/131437295/5621048.pdf
    • https://cdn.shopify.com/s/files/1/0428/7869/7631/files/sanctum_of_nabkha.pdf
    • https://cdn.shopify.com/s/files/1/0435/1872/2216/files/playable_races_5e.pdf
    • https://cdn.shopify.com/s/files/1/0427/7708/4070/files/25615802685.pdf
    • https://cdn.shopify.com/s/files/1/0432/4560/0936/files/gezepimakizarepusopazep.pdf
    • https://cdn.shopify.com/s/files/1/0429/3469/8147/files/lajalabaverenu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/bijalikupuxamimidesedol.pdf
    • https://cdn.shopify.com/s/files/1/0431/0391/2098/files/78516358023.pdf
    • https://cdn.shopify.com/s/files/1/0433/6159/9656/files/73665893987.pdf
    • https://cdn.shopify.com/s/files/1/0430/7730/4481/files/unofficial_world_champion_lol.pdf
    • https://cdn.shopify.com/s/files/1/0431/0577/9878/files/gozem.pdf
    • https://cdn.shopify.com/s/files/1/0436/7931/8166/files/daily_use_arabic_words_in_english.pdf
    • https://cdn.shopify.com/s/files/1/0430/3598/4029/files/compact_literature_9th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0437/3417/1800/files/rekewozasixumalakoteli.pdf
    • https://cdn.shopify.com/s/files/1/0432/7673/0533/files/naxezekako.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000061a4.bin
63b7df3d1e6c1367e86c8489a1594896f5d689067339f97bbba5ef97f6208108		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61A4 5716 bytes
font_01_sfnt_off0000751c.bin
462f4bc9ad8e618ac21ce82ebdb5f5233f22a479cb98d16a10767bf7c9745059		 pdf-font-stream PDF embedded font (sfnt) at offset 0x751C 10372 bytes
font_02_sfnt_off0000985b.bin
21bc13a6c632d778dac1523655e97f49b2800746deaf6e2731020414ab0fc7b8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x985B 16248 bytes

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