Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fe3d9cdd78070f8…

MALICIOUS

PDF

62.4 KB Created: 2020-08-09 19:55:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fa85ecb877e0139079282cf134fa8cfb SHA-1: ed484c61d0d85d4016b6d53c28ce4997622d64e3 SHA-256: 5fe3d9cdd78070f887b6ddfb7abb73a293c15daa291c4188f0f584cac2eeb40f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded links, with one specifically pointing to a known malicious redirector. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' confirms this, and the ML classifier strongly indicates maliciousness. The document body, though heavily obfuscated, contains the target URL, suggesting a phishing or scam lure.

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=la+racionalidad+de+los+actos+humanos+pdf
    • http://moferako.wishuponastaryorkies.com/uploads/1/3/2/7/132710712/8980647.pdf
    • http://files.elevatorbrewingco.com/uploads/1/3/1/8/131857983/2908661.pdf
    • http://files.shelleygreenyoga.com/uploads/1/3/1/3/131398378/7307645.pdf
    • http://files.launcestonrotarypassport.org/uploads/1/3/1/4/131437330/mopolomemujefom-kozowe.pdf
    • http://gediriruz.cpcavies.com/uploads/1/3/0/7/130739564/9070439.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/0655/7340/files/homeworx_hw_150_pvr.pdf
    • https://cdn.shopify.com/s/files/1/0430/4375/0049/files/40311606938.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/84770620138.pdf
    • https://cdn.shopify.com/s/files/1/0431/1518/4295/files/bixofotapebipaliti.pdf
    • https://cdn.shopify.com/s/files/1/0431/3264/9636/files/tamojowogipixoj.pdf
    • https://cdn.shopify.com/s/files/1/0435/8035/8811/files/63041391835.pdf
    • https://cdn.shopify.com/s/files/1/0437/8220/9698/files/xapadipapojisuwirasalefes.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/90278046640.pdf
    • https://cdn.shopify.com/s/files/1/0431/2442/4853/files/86709355599.pdf
    • https://cdn.shopify.com/s/files/1/0447/3444/7770/files/breath_of_the_wild_wizzrobe.pdf
    • https://cdn.shopify.com/s/files/1/0446/7815/2345/files/58801320687.pdf
    • https://cdn.shopify.com/s/files/1/0429/2041/1289/files/votovaxixuwasusew.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_off0000b54e.bin
ea8f85903cd6b976b16bc6516624d3a8f17970eaa972b03d9a7416a671e8d01b
pdf-font-stream PDF embedded font (sfnt) at offset 0xB54E 5336 bytes
font_01_sfnt_off0000c749.bin
245ca142a985c635a6f66677b3d9d8f66e70de69f2f938c0b4c99f71a0942dbf
pdf-font-stream PDF embedded font (sfnt) at offset 0xC749 10816 bytes