Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca054815a09669d4…

MALICIOUS

PDF

34.7 KB Created: 2020-08-01 13:06:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eb63650246e0473590ed46690a789ca5 SHA-1: 2ef10d4ebbc0b4f8ca5da78b1f02d89789e1052d SHA-256: ca054815a09669d4a967d5b183d35dac31e9bfc797cfb2a960f736f448bc15c6
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a significant number of embedded URLs, with one identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The presence of a large link farm suggests an attempt to lure users to external sites, likely for phishing or malware delivery. No scripts were extracted, but the PDF structure and embedded links are sufficient to infer the 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.ru/pify?keyword=zelda+n64+rom
    • http://files.logosassociatesltd.com/uploads/1/3/0/7/130775102/4698029.pdf
    • http://files.mullinsliquidations.com/uploads/1/3/0/8/130874019/vugafulapezi-taxesofukonakup-xasedak-jipuxa.pdf
    • http://files.lymefilm.org/uploads/1/3/0/8/130874544/wafamakisexise-baduda-dirivazebo.pdf
    • https://cdn.shopify.com/s/files/1/0433/1690/4104/files/79336605858.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/texojorigerusoxuduk.pdf
    • https://cdn.shopify.com/s/files/1/0436/3298/4222/files/faluvamiriselojugusabar.pdf
    • https://cdn.shopify.com/s/files/1/0430/7052/1495/files/redijagaresunufuvosuj.pdf
    • https://cdn.shopify.com/s/files/1/0428/5821/7631/files/wiwijof.pdf
    • https://cdn.shopify.com/s/files/1/0431/9071/4532/files/xogusoxakinobimopobul.pdf
    • https://cdn.shopify.com/s/files/1/0431/8189/9944/files/74133433484.pdf
    • https://cdn.shopify.com/s/files/1/0432/8544/6824/files/dunefiregonetazalomupeze.pdf
    • https://cdn.shopify.com/s/files/1/0433/6461/4303/files/zizesugadafugawepamumas.pdf
    • https://cdn.shopify.com/s/files/1/0433/6254/9910/files/xezibawuketisepulax.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_off00004ac8.bin
468f9429056663328e022ac35f59858d30b196654ccade741372760836fd5f2d
pdf-font-stream PDF embedded font (sfnt) at offset 0x4AC8 4992 bytes
font_01_sfnt_off00005bb1.bin
0ab7d305b8b9c16cef2a80ddfeb9ed803ed3eab69b32ee3bdd4cafd76ff98d19
pdf-font-stream PDF embedded font (sfnt) at offset 0x5BB1 10188 bytes