Malicious PDF — malware analysis report

Static analysis result for SHA-256 80da6c05cf9d1c1c…

MALICIOUS

PDF

34.5 KB Created: 2020-09-17 06:24:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ebde9f27a3c8754bbdee31e70399c634 SHA-1: b1a9f6b7e89a65aea8c5c1cb546065d79a21b410 SHA-256: 80da6c05cf9d1c1c019cc6d7681547bd9f3c485407707f30eb89cae30a4938ec
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, many pointing to disposable hosting, and one critical redirector link. This suggests a link farm or SEO manipulation tactic designed to drive traffic to malicious sites. The ML classifier strongly supports the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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.link/wix?keyword=zambales+philippines+hotels
    • http://files.shorelineuu.org/uploads/1/3/1/3/131380469/2529155.pdf
    • http://files.birthhealing.com/uploads/1/3/1/4/131438453/7605106.pdf
    • http://files.street-sharp.com/uploads/1/3/2/6/132695306/5632864.pdf
    • http://nakakazu.88jamz.com/uploads/1/3/0/7/130776131/97c97ecc91f9d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/8748/7385/files/nenil.pdf
    • https://cdn.shopify.com/s/files/1/0470/9675/8430/files/fukama.pdf
    • https://cdn.shopify.com/s/files/1/0432/9806/2501/files/ruxitopagoxesolojetozubiv.pdf
    • https://f3818bf6-6984-4aaa-94a4-aac8c32a3aad.filesusr.com/ugd/f91cf1_8acc330f3ca54b3f8e1ba5dcdd0af990.pdf?index=true
    • https://8bb06015-d935-44b5-a25b-fbfbcff88401.filesusr.com/ugd/64e449_e795c3e91bb746a0a5a6ed4c2516ac8f.pdf?index=true
    • https://1d26e9d9-527a-45fb-849f-164e1bb0fbeb.filesusr.com/ugd/9df9d6_1d10edf7253b4aea81fc2b593176001c.pdf?index=true
    • https://d2a6f346-9a73-4f55-8223-2028a4242d94.filesusr.com/ugd/ebc5f9_23a2699be1b341d9a891f17695563e18.pdf?index=true
    • https://f5896333-c3a6-4e3d-8010-95a9a13c34d9.filesusr.com/ugd/3ab5ed_4de5f205896342a89269dd2e687441af.pdf?index=true
    • https://cdn.shopify.com/s/files/1/0433/3774/4552/files/texuvomi.pdf
    • https://cdn.shopify.com/s/files/1/0436/0765/4563/files/plague_inc_android_mod_apk.pdf
    • https://cdn.shopify.com/s/files/1/0428/3056/1436/files/satellite_high_school_staff.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004bac.bin
4b07c318674694bddd2e42f92b038dec6fd08f7c3b04a55f751d0e3efa66a9e5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4BAC 5060 bytes
font_01_sfnt_off00005cb4.bin
32ec72356d2e866f3e96d23c989e6232d9fce6eba96e4d7f39e2afaa57389960		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5CB4 9600 bytes

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