Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0e3c57b6a3bfbb4…

MALICIOUS

PDF

44.4 KB Created: 2020-08-05 12:50:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 306aa697a325255ca5746d0a552e95d4 SHA-1: ce98c0e9c261e29c6cba05a0203ea78aa4303d32 SHA-256: d0e3c57b6a3bfbb4c52a318f1e504d9cb73af88acd8467fa49f3b778ae56b4fb
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1200 Hardware Add-in T1059.001 PowerShell

The PDF contains a link farm designed to appear as legitimate PDF downloads, but the primary link redirects to malicious infrastructure. The ML classifier strongly indicated maliciousness. The document body itself is heavily obfuscated but contains the primary malicious URL, suggesting a lure to a phishing or malware distribution site.

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=difference+between+chordates+and+non+chordates+pdf
    • http://files.thismatteroffaith.net/uploads/1/3/1/4/131406498/vewirenigazubi.pdf
    • http://files.christinacasillo.com/uploads/1/3/0/7/130775308/1001088.pdf
    • http://files.sportworkschiro.com/uploads/1/3/1/4/131437147/depus-fimirefokironi.pdf
    • http://files.ryangardner.org/uploads/1/3/0/9/130969312/01cf499be.pdf
    • http://files.brockportmall.com/uploads/1/3/1/4/131407802/ludogebij-dufiwameropem-fivewig.pdf
    • https://cdn.shopify.com/s/files/1/0440/5932/8662/files/xotiwaxa.pdf
    • https://cdn.shopify.com/s/files/1/0436/1430/6467/files/op_amp_comparator_circuits.pdf
    • https://cdn.shopify.com/s/files/1/0432/5172/8546/files/wunojufam.pdf
    • https://cdn.shopify.com/s/files/1/0438/2133/4688/files/rojakexorajibos.pdf
    • https://cdn.shopify.com/s/files/1/0435/6653/0728/files/gomaj.pdf
    • https://cdn.shopify.com/s/files/1/0430/4168/5665/files/godemituj.pdf
    • https://cdn.shopify.com/s/files/1/0429/1955/9335/files/79534886650.pdf
    • https://cdn.shopify.com/s/files/1/0430/9457/3205/files/agency_coupled_with_an_interest.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/dofupuz.pdf
    • https://cdn.shopify.com/s/files/1/0437/9492/3677/files/40176958289.pdf
    • https://cdn.shopify.com/s/files/1/0427/9818/6663/files/jojosovu.pdf
    • https://cdn.shopify.com/s/files/1/0431/3884/2779/files/69457661986.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_off00006fef.bin
ca03b831cc23a3139866a7a922c2beef035a78c57cc00fe29264e4dd6098bfb1
pdf-font-stream PDF embedded font (sfnt) at offset 0x6FEF 5444 bytes
font_01_sfnt_off0000827d.bin
778ba76c52ce9c150ef12d5f2711a841e9c2a45859e903be0966c645d8b1b528
pdf-font-stream PDF embedded font (sfnt) at offset 0x827D 9908 bytes