Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d506adcd9980615…

MALICIOUS

PDF

49.2 KB Created: 2020-07-28 11:22:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4fae4a800900c388c89d2624dbaf1b71 SHA-1: 7ec30871c740a500a87f11ed7ec86264595b3630 SHA-256: 6d506adcd998061540fcdc19fe7cd075f084ddbc6e5376e78e0ec444f9688468
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one pointing to known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. While no scripts were extracted, the presence of numerous links suggests an attempt to lure users to malicious sites, potentially for phishing or malware distribution.

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/pify?keyword=benzaldoxime+exists+in+how+many+forms
    • http://files.stevewestgroup.com/uploads/1/3/0/7/130740256/pajibizitazuvat.pdf
    • http://files.sharonreay.com/uploads/1/3/0/8/130814118/dowikatu_demanefazikelif_witakulo_dejaxod.pdf
    • http://files.dunphyshandguntraining.com/uploads/1/3/2/6/132681566/d354c601d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0427/5663/6828/files/20680960046.pdf
    • https://cdn.shopify.com/s/files/1/0435/1423/2996/files/tupefededokexuladekiki.pdf
    • https://cdn.shopify.com/s/files/1/0429/8693/0329/files/vegukekiposapuvofir.pdf
    • https://cdn.shopify.com/s/files/1/0430/6518/0314/files/38799286802.pdf
    • https://cdn.shopify.com/s/files/1/0436/0595/0626/files/fifepisi.pdf
    • https://cdn.shopify.com/s/files/1/0436/9920/8346/files/87616814410.pdf
    • https://cdn.shopify.com/s/files/1/0430/3834/3322/files/31534072190.pdf
    • https://cdn.shopify.com/s/files/1/0433/8758/4677/files/viranagemuwumazunil.pdf
    • https://cdn.shopify.com/s/files/1/0432/2567/7992/files/90287854482.pdf
    • https://cdn.shopify.com/s/files/1/0429/1582/3772/files/jusuxonikanuwe.pdf
    • https://cdn.shopify.com/s/files/1/0435/3366/4408/files/97496057959.pdf
    • https://cdn.shopify.com/s/files/1/0439/4038/0840/files/jujopijilotofo.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_off000084a1.bin
af601ed0e00a0804e8f9e370ae424c8808b1cd8aa6678c20fbab227eed6403a2
pdf-font-stream PDF embedded font (sfnt) at offset 0x84A1 5296 bytes
font_01_sfnt_off00009697.bin
408cd1b760da3c74b7009e79ae32e332331428d5f14c2ff0b4be5b3d4a715c57
pdf-font-stream PDF embedded font (sfnt) at offset 0x9697 9560 bytes