Malicious PDF — malware analysis report

Static analysis result for SHA-256 d681ecf501a548ee…

MALICIOUS

PDF

44.2 KB Created: 2020-09-18 14:56:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d2a91c8e5bfbd63a5ac4992bfcf9e392 SHA-1: 3762476c56c2e85ba13532a8d9c1697013cb917a SHA-256: d681ecf501a548eeec90e51e90464a12165d848de230822028d5224545c575eb
152 Risk Score

Malware Insights

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

The PDF was flagged by a critical heuristic for linking to a known malicious redirector and another critical heuristic for containing a mass external PDF link farm. The ML classifier also strongly indicated maliciousness. The document body contains embedded URLs that are part of this link farm, suggesting a coordinated effort to distribute malicious links or 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.club/wix?keyword=tipos+de+variables+en+programacion
    • http://files.originalsexyslave.com/uploads/1/3/0/9/130969004/ca2abe.pdf
    • http://files.peytonpickenpaugh.com/uploads/1/3/0/8/130874369/mafasigidofap_jajemifobukugu_dexijokozot_lixelu.pdf
    • http://files.danielsswelltunes.com/uploads/1/3/1/3/131398224/f3e51f23b5f.pdf
    • http://files.bareandpolished.com/uploads/1/3/0/7/130738921/fesujisagopivupas.pdf
    • https://ef78ec8c-8275-47af-9a5d-bd9a59ea8425.filesusr.com/ugd/f08e01_26e02e46d7cb43e0a226deb19efa7275.pdf?index=true
    • https://4013eede-9d32-4eae-9cc0-8f3a09a01cc3.filesusr.com/ugd/03ae60_7e795da5e73a432596f463233478fbd6.pdf?index=true
    • https://cdn.shopify.com/s/files/1/0429/7415/0809/files/kojiluj.pdf
    • https://cdn.shopify.com/s/files/1/0440/4995/7029/files/3ds_max_text_animation.pdf
    • https://cdn.shopify.com/s/files/1/0438/5954/2176/files/curriculum_vitae_format_example_in_kenya.pdf
    • https://cdn.shopify.com/s/files/1/0484/1229/5326/files/70998621166.pdf
    • https://cdn.shopify.com/s/files/1/0432/2213/9041/files/oracle_forms_java_version.pdf
    • https://bc0bde5e-2d4b-45ff-998d-43a980e28126.filesusr.com/ugd/5262df_12377e06e974425cb576ba34d46d77ed.pdf?index=true
    • https://73a31897-aee9-4097-81eb-0b6f2adb49f3.filesusr.com/ugd/3e9e83_cb9acfff92bf4b5b9c40851db9a5cf0d.pdf?index=true
    • https://256093b7-876c-41fc-9be0-09f84fd0bee0.filesusr.com/ugd/7d1dc9_67b37806d35142eea50b1c1f3abae914.pdf?index=true
    • 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_off00006a9a.bin
5fbd89c79e2a7296057608698b6e5a9e030772ac6adad68c1bcb375540486b79		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A9A 5540 bytes
font_01_sfnt_off00007d60.bin
0a93817388c89d4e215c3a76cc97872fc78b4b12fa6e5fe202b3e6411d6ab245		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D60 11392 bytes

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