Malicious PDF — malware analysis report

Static analysis result for SHA-256 0acd206414951ff5…

MALICIOUS

PDF

50.8 KB Created: 2020-07-12 20:47:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b568102eb3cc68c679da63832df48062 SHA-1: 38143d03c43949e5d0316e28760253e67aa836f6 SHA-256: 0acd206414951ff55045d1a0c068eb2a47eafd2789f9c7094545e570ca12c4b7
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, many of which point to redirector infrastructure and potentially malicious sites. The ML classifier strongly indicated maliciousness, and the PDF was flagged for linking to known malicious redirectors. While no scripts were explicitly extracted, the structure suggests an attempt to leverage SEO link farming for malicious redirection.

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.ru/wb?keyword=c%20language%20technical%20questions%20and%20answers%20pdf
    • http://files.huntersvillepres.org/uploads/1/3/1/4/131438443/1924aa32565007.pdf
    • http://files.annafoxryan.com/uploads/1/3/1/4/131483267/8915316.pdf
    • http://files.antoniodavidsinopoli.com/uploads/1/3/0/8/130873907/4090271.pdf
    • http://files.rqgenesis.co/uploads/1/3/2/3/132303023/wadelanuzosidubobu.pdf
    • http://files.nokillhuntsville.com/uploads/1/3/1/4/131455883/jalupi.pdf
    • http://files.mistergteacher.com/uploads/1/3/0/8/130873997/ea1710b61be90.pdf
    • http://files.fatimaschool.org/uploads/1/3/1/4/131453018/lasixobu-kezitezize-zimaminesix-bovudipaduvav.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://rodawewek.files.wordpress.com/2020/06/famasufamaradujefatewadi.pdf
    • https://livegino.files.wordpress.com/2020/06/96077529494.pdf
    • https://wezivederij.files.wordpress.com/2020/06/vesejunuxo.pdf
    • https://cdn.shopify.com/s/files/1/0427/3537/0407/files/39965748288.pdf
    • https://cdn.shopify.com/s/files/1/0430/8307/1650/files/91996345607.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/womonevixaxijebuvi.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/71340125447.pdf
    • https://cdn.shopify.com/s/files/1/0430/3116/7137/files/42382720611.pdf
    • https://cdn.shopify.com/s/files/1/0430/4440/5397/files/baxejefejodufarenabipo.pdf
    • https://cdn.shopify.com/s/files/1/0430/5184/3737/files/zixazudubebadige.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_off000086d9.bin
429a5ce0b562506f05a5fb8378b59916091a7886c5ad13ae4f39b8e2c8721da1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x86D9 5540 bytes
font_01_sfnt_off000099b5.bin
de3fe80eb3c50e1c6a7f2adea6243b40b208a288283549d06b6414f145f7b752		 pdf-font-stream PDF embedded font (sfnt) at offset 0x99B5 10520 bytes

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