Malicious PDF — malware analysis report

Static analysis result for SHA-256 2152bf232dd9c38b…

MALICIOUS

PDF

42.4 KB Created: 2020-08-12 12:55:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dcab94c62272fb50491965606d5dcad7 SHA-1: 9d6dccc8697d7bcc941beba63a8996eac5f32f18 SHA-256: 2152bf232dd9c38b22957ed0fb365a5edc308dc0f6258749d9015d71e3c267df
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF contains a link to a redirector, `https://ttraff.cc/pify?keyword=bengali+golpo+boi+pdf+download`, which is indicative of malicious activity. This redirector likely leads to a link farm of PDF files, as suggested by the PDF_SEO_LINK_FARM heuristic. The document body, though heavily obfuscated, contains references to the redirector and several Shopify-hosted PDF links, reinforcing the lure mechanism. No scripts were extracted from this sample.

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.cc/pify?keyword=bengali+golpo+boi+pdf+download
    • http://files.paintedbuttonquail.com/uploads/1/3/2/7/132740620/dekivi_funotif_japivobafusurub.pdf
    • http://files.rumjourney.com/uploads/1/3/1/3/131398084/a0a83.pdf
    • http://files.schilbersjewelrycastle.com/uploads/1/3/0/7/130776088/4bff4411f41b8e6.pdf
    • http://files.mactireirishwolfhounds.com/uploads/1/3/0/8/130813644/85682.pdf
    • https://cdn.shopify.com/s/files/1/0438/8116/9051/files/hobbits_and_orcs_problem.pdf
    • https://cdn.shopify.com/s/files/1/0428/0143/0695/files/kajafopusuzeboluzelidize.pdf
    • https://cdn.shopify.com/s/files/1/0433/8706/0378/files/zewele.pdf
    • https://cdn.shopify.com/s/files/1/0434/3260/7894/files/momiwivemokanaxuxamavu.pdf
    • https://cdn.shopify.com/s/files/1/0434/3015/0300/files/8243871008.pdf
    • https://cdn.shopify.com/s/files/1/0434/5433/3093/files/4494487776.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xasojikunu.pdf
    • https://cdn.shopify.com/s/files/1/0431/6397/5835/files/gunopu.pdf
    • https://cdn.shopify.com/s/files/1/0430/8421/8532/files/laxafurerate.pdf
    • https://cdn.shopify.com/s/files/1/0435/5165/4047/files/6109664553.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/wexidemunuviviradepinitim.pdf
    • https://cdn.shopify.com/s/files/1/0437/7529/5640/files/order_without_design_alain_bertaud.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_off00004ca6.bin
0d382e41508d6f7cdbfdf0b052be1d0cc89c5d86988d6a7c968548bb5c249e55		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4CA6 5216 bytes
font_01_sfnt_off00005e83.bin
1e2749aa3a6fd962c03af7938dbfdf4d3bec50c2726936e3e1edd3b96df9b247		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E83 8376 bytes
font_02_sfnt_off0000795d.bin
f61bd037524b3d4b23bb4257a164ee606cfcc655fd02303d56d28cf43e3e31b0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x795D 10348 bytes

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