Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fdb7e8bbf0433f7…

MALICIOUS

PDF

37.5 KB Created: 2020-08-28 21:49:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cccd80fbe8a587966271a282329f94c7 SHA-1: e8acf009ad9b38a659c80213ee440140bb9dba12 SHA-256: 5fdb7e8bbf0433f7376467c0c28803c8c9d9dd4b2bd1bb20aa77bf9429f70eb3
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm of 13 external PDF documents, with the primary link directing to a known malicious redirector. The ML classifier also strongly indicated maliciousness. This suggests the document is designed to lead users to malicious infrastructure, likely for further exploitation or phishing.

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/wix?keyword=partition+flute+traversiere+chanson+connue
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0448/0860/1762/files/characteristics_of_product_life_cycle.pdf
    • https://cdn.shopify.com/s/files/1/0430/9663/7597/files/tawupan.pdf
    • https://cdn.shopify.com/s/files/1/0431/3602/4737/files/figulaxalu.pdf
    • https://cdn.shopify.com/s/files/1/0437/9266/2688/files/69708148213.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/fuwemosuwizukuxitakalav.pdf
    • https://cdn.shopify.com/s/files/1/0434/0567/2597/files/jack_el_canguro_pelicula_completa_en.pdf
    • https://static.usrfiles.com/ugd/b8c837_7642f6ffc28645288c5cd434533edc10.pdf
    • https://static.usrfiles.com/ugd/b8c837_89ca5d07582545b3a6e3f7cf3843dbbc.pdf
    • https://static.usrfiles.com/ugd/b8c837_95984a5f735046ce9fcdf2916bf839b3.pdf
    • https://static.usrfiles.com/ugd/b8c837_757eb45f7b604307b38eaf564db98e1c.pdf
    • https://static.usrfiles.com/ugd/b8c837_a95941689db5425b9f4a0dd5103113fd.pdf
    • https://cdn.shopify.com/s/files/1/0429/1022/0447/files/lapofanolenowetilaximu.pdf
    • https://cdn.shopify.com/s/files/1/0438/2107/2546/files/mujubazixe.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_off0000512c.bin
a6efec362b49f55165dd2e4e99429ab22bb0f1398f8dbdacc35c1cc4f5dcb805
pdf-font-stream PDF embedded font (sfnt) at offset 0x512C 5032 bytes
font_01_sfnt_off00006246.bin
ea0b08ccd36d568fcf46a6c159de6b6604f3f4814c3c2a130498891f2116d12f
pdf-font-stream PDF embedded font (sfnt) at offset 0x6246 11696 bytes