Malicious PDF — malware analysis report

Static analysis result for SHA-256 b57fcaafe07e2888…

MALICIOUS

PDF

35.7 KB Created: 2020-08-22 21:07:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d2fd3863c608be4a5eb8c98d3897c361 SHA-1: c3fd3216f07c4be9a41d2f8668d6ebcbf165d1bc SHA-256: b57fcaafe07e2888e41f1b5f090b81303ba6b94a26d625e4ab94d2b3e404f395
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The primary attack pattern appears to be a link farm, potentially for SEO manipulation or to distribute further malicious content via the redirector.

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.cc/pify?keyword=transformador+de+alta+frecuencia+pdf
    • http://files.ravenbeak.com/uploads/1/3/1/3/131380397/2937556.pdf
    • http://kujutim.dentistryvistaca.com/uploads/1/3/2/3/132303189/5280797.pdf
    • http://kivop.livingconscious.net/uploads/1/3/1/4/131454762/2894178.pdf
    • http://vabeg.aihep.org/uploads/1/3/0/7/130738799/gexurut.pdf
    • http://files.troliosprint.net/uploads/1/3/0/7/130739996/jibip-jipif-tazemolapajumol-posabani.pdf
    • https://cdn.shopify.com/s/files/1/0427/4647/8758/files/25328339085.pdf
    • https://cdn.shopify.com/s/files/1/0434/9915/9718/files/aditya_hrudayam_stotram_in_telugu.pdf
    • https://cdn.shopify.com/s/files/1/0430/3503/3757/files/vuxebotikelemuponavex.pdf
    • https://cdn.shopify.com/s/files/1/0431/8671/6830/files/bus_topology_advantages_and_disadvantages.pdf
    • https://cdn.shopify.com/s/files/1/0427/5660/4070/files/important_days_and_dates_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/2588/2518/files/welelobasotexutawato.pdf
    • https://cdn.shopify.com/s/files/1/0430/1619/2153/files/33761371980.pdf
    • https://cdn.shopify.com/s/files/1/0431/2465/4241/files/nolem.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_off00004b4d.bin
cc4d16ac49fce034aa623c6996eb8252e438ab6345b5dd043cd5a8a2d90390e4
pdf-font-stream PDF embedded font (sfnt) at offset 0x4B4D 5248 bytes
font_01_sfnt_off00005d08.bin
999d0384f874a03c52d717cfa21634984dcd369ed9c954858a00b1c0dade84a2
pdf-font-stream PDF embedded font (sfnt) at offset 0x5D08 10836 bytes