Malicious PDF — malware analysis report

Static analysis result for SHA-256 6befeda15c705011…

MALICIOUS

PDF

47.3 KB Created: 2020-09-20 08:13:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6adaf53cd572f3c0906e18f5186dd517 SHA-1: fe2ff8bc94a349fad9065df15c75a10d45def72a SHA-256: 6befeda15c705011184a0ca9a12c84dadbd1df3ece698b1beac9bdb78289a92e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to benign Shopify URLs, but one prominent link directs to a malicious redirector. The document body, though partially corrupted, contains text related to 'peer to peer network' and the malicious URL, suggesting a lure to a phishing or malware distribution site. The ML classifier strongly flagged this PDF as malicious, reinforcing the assessment of a malicious redirector.

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.me/wix?keyword=5+disadvantages+of+peer+to+peer+network
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/9902/1731/files/ofac_countries_list_2018.pdf
    • https://cdn.shopify.com/s/files/1/0428/1883/0492/files/kashmir_university_bed_date_sheet_2019.pdf
    • https://cdn.shopify.com/s/files/1/0440/7223/9269/files/cardiology_guidelines_esc.pdf
    • https://cdn.shopify.com/s/files/1/0462/6386/1405/files/46612298679.pdf
    • https://cdn.shopify.com/s/files/1/0437/7352/6178/files/45063569167.pdf
    • https://cdn.shopify.com/s/files/1/0440/6640/6552/files/57411314441.pdf
    • https://cdn.shopify.com/s/files/1/0465/3940/7519/files/14486415827.pdf
    • https://cdn.shopify.com/s/files/1/0428/8544/7833/files/corrugated_box_profile_metal_roofing_sheets.pdf
    • https://cdn.shopify.com/s/files/1/0434/2376/0536/files/9758084195.pdf
    • https://cdn.shopify.com/s/files/1/0436/1335/6189/files/18546302197.pdf
    • https://cdn.shopify.com/s/files/1/0428/8223/6583/files/publication_list.pdf
    • https://cdn.shopify.com/s/files/1/0431/3550/0439/files/arteritis_de_takayasu_pediatria.pdf
    • https://4049409b-b3d7-404e-ac73-1de98d046d37.filesusr.com/ugd/21a131_6297f18a821e4655b8a4e5929ed4af3d.pdf?index=true
    • https://0d2abab3-c569-46d6-8e84-755e1aa8d242.filesusr.com/ugd/de02f3_273c7978288540a99a669a62493adee8.pdf?index=true
    • https://33612a06-6d2a-4f63-b499-b09f4baf8462.filesusr.com/ugd/96564c_af2ccef730ba4cc8b05b002e61e61829.pdf?index=true
    • https://949b6800-d907-41aa-abbb-f84d9759daf2.filesusr.com/ugd/bcc0e4_e2ccfef25ccd4de0abf19eef30eca63e.pdf?index=true
    • https://e70b4755-387f-45c1-8102-d10da52543ce.filesusr.com/ugd/2a2e94_80d6daa96a9246f395a95b01972ddde6.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007aff.bin
015fe51703c194e964c29b0d27f2df4fd0647f663042bfe23a13f7cee2505b0c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7AFF 5424 bytes
font_01_sfnt_off00008da2.bin
213d240898975c472aa6edad4000541d08b74ac06e083418810a4a3374878f27		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8DA2 10092 bytes

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