Malicious PDF — malware analysis report

Static analysis result for SHA-256 40ed9d9795aad7c7…

MALICIOUS

PDF

59.7 KB Created: 2020-08-22 18:51:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 122a6660acd76fe45e374ed992b96cf4 SHA-1: ce71774a460606b6493a037f43f19ff2e6168d56 SHA-256: 40ed9d9795aad7c73751325afd8c81bb5f0b466dfc15e358366e89ececb0f38f
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically 'https://ttraff.ru/pify?keyword=bengali+calligraphy+book+pdf'. This indicates the document's primary purpose is to redirect users to malicious sites. The presence of a large number of external PDF links, many hosted on Shopify, further suggests a link farm or SEO manipulation tactic to distribute malicious content. No scripts were extracted, but the PDF structure and embedded URLs strongly indicate a phishing or redirection attack.

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=bengali+calligraphy+book+pdf
    • http://files.fremontbands.com/uploads/1/3/1/6/131637553/092df49216b.pdf
    • http://fuletub.trinitywellnesscharleston.com/uploads/1/3/0/9/130969525/mobotumape.pdf
    • http://tenofuw.ipswichhumanegroup.org/uploads/1/3/0/7/130776394/tujavuroget_xokijube.pdf
    • https://cdn.shopify.com/s/files/1/0439/2986/2312/files/5128719868.pdf
    • https://cdn.shopify.com/s/files/1/0431/8950/2110/files/kumikukozafun.pdf
    • https://cdn.shopify.com/s/files/1/0435/2750/4024/files/fundamental_concepts_of_accounting.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/23158701460.pdf
    • https://cdn.shopify.com/s/files/1/0431/3631/9639/files/26118009258.pdf
    • https://cdn.shopify.com/s/files/1/0431/1459/4464/files/vomufowozoteraveg.pdf
    • https://cdn.shopify.com/s/files/1/0428/2646/5436/files/26882409154.pdf
    • https://cdn.shopify.com/s/files/1/0435/5024/5028/files/41909053790.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/51851907441.pdf
    • https://cdn.shopify.com/s/files/1/0435/8019/4975/files/74160039361.pdf
    • https://cdn.shopify.com/s/files/1/0434/5040/0928/files/besafusomitodavupu.pdf
    • https://cdn.shopify.com/s/files/1/0435/6633/4111/files/77267003973.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_off00008fea.bin
6b834c9adc9c2f441e8e655cf03d1cd61b4b23916e18925d16cdbc358b02399f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8FEA 5596 bytes
font_01_sfnt_off0000a2e7.bin
d373e0a43e3e59e7a8db14d7959b4308532f17b78bad1fe3d1bf69a2f055caee		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA2E7 10080 bytes
font_02_sfnt_off0000c5b5.bin
5477988160f357835074c5c7a8294ae42dfa2677dc3eaed4b4977dcad6f14abe		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC5B5 17996 bytes

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