Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d3b1da99aea2d0a…

MALICIOUS

PDF

34.7 KB Created: 2020-08-21 16:55:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ceeed1acb4a50425459f221a964854e9 SHA-1: f66dbce3a064209f71d2047444227c06f49bfac2 SHA-256: 5d3b1da99aea2d0aeb9f9949e42b2d33f2bc28f743616dca46477c9b8e4dbf76
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, identified as a link farm, with one prominent link redirecting to a known malicious domain. The ML classifier strongly indicated maliciousness, and the presence of a redirector link suggests an attempt to lead the user to a malicious site, likely for phishing or malware distribution. No scripts were extracted, but the document body and heuristics point to a link-based 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.com/pify?keyword=thermal+and+sound+insulation+materials+pdf
    • http://fubep.relaxedmindtaichi.com/uploads/1/3/1/1/131164243/bokuxosigit_dabelodasemew.pdf
    • http://files.ryansullivan.tv/uploads/1/3/1/4/131438639/fafetaroto-pojikitakog.pdf
    • http://files.paradigmapps.com/uploads/1/3/1/1/131164474/zamomupalikaf_mewatowokat.pdf
    • http://files.venusevanswinters.com/uploads/1/3/0/8/130813885/xadapiru.pdf
    • http://jamibig.mscareyswebsite.com/uploads/1/3/0/9/130969536/2299574.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0440/8619/8424/files/69775464125.pdf
    • https://cdn.shopify.com/s/files/1/0431/0820/4708/files/kejexixuwemut.pdf
    • https://cdn.shopify.com/s/files/1/0428/2122/2567/files/aeriforme_significado_en_espaol.pdf
    • https://cdn.shopify.com/s/files/1/0435/1092/3423/files/23700729813.pdf
    • https://cdn.shopify.com/s/files/1/0431/9114/0509/files/sedalelotomiva.pdf
    • https://cdn.shopify.com/s/files/1/0431/4424/9499/files/xowozasijat.pdf
    • https://cdn.shopify.com/s/files/1/0440/4353/4486/files/pikopogunexubeli.pdf
    • https://cdn.shopify.com/s/files/1/0432/0965/4440/files/8356453690.pdf
    • https://cdn.shopify.com/s/files/1/0428/7106/2684/files/avery_label_template_in_microsoft_word.pdf
    • https://cdn.shopify.com/s/files/1/0437/1503/5288/files/ramilad.pdf
    • https://cdn.shopify.com/s/files/1/0433/0435/3950/files/xivawosidamani.pdf
    • https://cdn.shopify.com/s/files/1/0433/0458/3318/files/98710439479.pdf
    • https://cdn.shopify.com/s/files/1/0440/6925/7366/files/moluwipip.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_off00004d26.bin
9c8a25d8affa050c85b463edd81861c8e94c644455d95b36dcc540a802b80b12		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4D26 5228 bytes
font_01_sfnt_off00005ec4.bin
4d2f57a1814c9e40417cb4db84133a930b334c13dcea405ba67ff6cd766c46a1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5EC4 9020 bytes

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