Malicious PDF — malware analysis report

Static analysis result for SHA-256 243f7348830c1789…

MALICIOUS

PDF

40.9 KB Created: 2020-08-21 21:42:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e94a7a61f09526cc4eaf580bb03933d9 SHA-1: e820bc366311794d8d8f1f6f02928d847842cc74 SHA-256: 243f7348830c1789fcbebdd07852a6ad5f921633e5cf536bb805c042eacbbe29
154 Risk Score

Malware Insights

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

The PDF was flagged by multiple critical heuristics indicating malicious redirector links and a link farm. The ML classifier also strongly indicated maliciousness. The document body contains a URL that appears to be a lure for search engine optimization, and the embedded links likely serve to redirect users to malicious sites or download further payloads. The presence of numerous external links, including one to a known malicious redirector, suggests a phishing or content-luring attack pattern.

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/pify?keyword=definition+and+characteristics+of+research+pdf
    • http://fakodo.msiphotography.net/uploads/1/3/0/8/130813714/xodigadulewoson-gujuvudetip-popotogexanakut-vigapezek.pdf
    • http://files.brianasamuelson.com/uploads/1/3/0/7/130740166/pizizapu.pdf
    • http://setekusan.joyfultreasureschildcare.com/uploads/1/3/2/6/132695675/fugut-bixaloxop-wawudu.pdf
    • http://files.iymstudio.com/uploads/1/3/0/7/130738943/6004449.pdf
    • https://cdn.shopify.com/s/files/1/0434/3290/2806/files/92266941218.pdf
    • https://cdn.shopify.com/s/files/1/0439/2045/7883/files/zokazuvivosobexenoso.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kesazemoluvumexon.pdf
    • https://cdn.shopify.com/s/files/1/0439/0918/5688/files/65625886775.pdf
    • https://cdn.shopify.com/s/files/1/0430/8038/4674/files/person_centred_theory_in_counselling.pdf
    • https://cdn.shopify.com/s/files/1/0434/2090/9733/files/80721704705.pdf
    • https://cdn.shopify.com/s/files/1/0428/6752/3743/files/cash_flow_sample.pdf
    • https://cdn.shopify.com/s/files/1/0439/3664/5275/files/mesozowumuzoti.pdf
    • https://cdn.shopify.com/s/files/1/0430/4407/7722/files/zupej.pdf
    • https://cdn.shopify.com/s/files/1/0437/3836/6113/files/29159921802.pdf
    • https://cdn.shopify.com/s/files/1/0430/8893/7120/files/15355566501.pdf
    • https://cdn.shopify.com/s/files/1/0436/0408/2851/files/52543995801.pdf
    • https://cdn.shopify.com/s/files/1/0434/4017/7317/files/jasizakezujepukifubo.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_off00006265.bin
a4908b65c3fa0c059cf6c2beaef8440f74038a38a2dc12a227554432f0816839		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6265 5212 bytes
font_01_sfnt_off0000741a.bin
8375dbc5361ff432f585e59daa8e2976928f888848ae418fe5364954bbb067b5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x741A 10068 bytes

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