Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfa95e5c1416a148…

MALICIOUS

PDF

40.4 KB Created: 2020-08-14 13:26:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 21056474ba167823f526be9455221746 SHA-1: ab241a3872d31cbeac1fca68704117408e57a9b8 SHA-256: bfa95e5c1416a1480b4191ece32a17f61065075628128c6a88466b4b4fa73f6e
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external resources, indicating a link farm or redirection strategy. One critical heuristic identified a link to known malicious redirector infrastructure at https://ttraff.com/wb?keyword=vanity%20fair%20a%20novel%20without%20a%20hero%20pdf. The ML classifier also strongly indicated maliciousness. No scripts were extracted, and the document body was heavily obfuscated, but the primary attack pattern is clear from the link structure and heuristics.

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.com/wb?keyword=vanity%20fair%20a%20novel%20without%20a%20hero%20pdf
    • http://files.preciousgemminis.com/uploads/1/3/2/6/132681352/528793.pdf
    • http://xupovi.mariemanski.com/uploads/1/3/1/6/131606263/sukuzubejijug-rapuzib-wekibepuw.pdf
    • http://files.wildlifeecology.org/uploads/1/3/0/8/130814594/9952308.pdf
    • http://votodo.louisefassart.com/uploads/1/3/0/8/130814674/puvojaxeku-rowux-fimuvepigexaz.pdf
    • https://cdn.shopify.com/s/files/1/0430/8343/2096/files/terafewe.pdf
    • https://cdn.shopify.com/s/files/1/0431/3251/8555/files/saforolomezewa.pdf
    • https://cdn.shopify.com/s/files/1/0429/0147/1388/files/wevodufenutipuditanegexa.pdf
    • https://cdn.shopify.com/s/files/1/0436/1483/0749/files/1020_cold_rolled_steel_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0430/3287/1074/files/pozijavi.pdf
    • https://cdn.shopify.com/s/files/1/0431/5942/1092/files/mufuz.pdf
    • https://cdn.shopify.com/s/files/1/0431/8652/0224/files/vamanokotifogijo.pdf
    • https://cdn.shopify.com/s/files/1/0430/8385/8074/files/63963275002.pdf
    • https://cdn.shopify.com/s/files/1/0428/8380/9439/files/15199359400.pdf
    • https://cdn.shopify.com/s/files/1/0434/7432/1560/files/rujiwebujadekegikivube.pdf
    • https://cdn.shopify.com/s/files/1/0435/6410/5886/files/sivomexipavisejopupaf.pdf
    • https://cdn.shopify.com/s/files/1/0432/0398/5570/files/sokijevagog.pdf
    • https://cdn.shopify.com/s/files/1/0428/7961/5142/files/enable_command_blocks.pdf
    • https://cdn.shopify.com/s/files/1/0431/3281/3469/files/80436336631.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000606d.bin
0da85f1bb50c7103085ca470c139a1068232d3f52924c19e75ef73e99a96a21e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x606D 5172 bytes
font_01_sfnt_off0000721b.bin
d2d6ffa4aa52dcf9d3add75acf6333fe2b54717825af3a819a196712b28ddb65		 pdf-font-stream PDF embedded font (sfnt) at offset 0x721B 10044 bytes

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