Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f2aaec4b53df4c7…

MALICIOUS

PDF

49.6 KB Created: 2020-07-28 06:21:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e48019ec9caaed510144b871a7b388dc SHA-1: 77dc6788f4b4e75484f612513d2743c2fa309656 SHA-256: 0f2aaec4b53df4c7910f2d9eb119b89371e28f683dc88df8357d0d0b375dabc8
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a large number of embedded links, with one identified as a known malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a deliberate attempt to create a link farm, likely to obscure malicious destinations or for SEO manipulation. The ML classifier also flagged the PDF as malicious with high confidence. The primary malicious IOC is the redirector URL, which is likely used to funnel victims to further malicious content.

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=vishwakarma+bhagwan+ka+photo++karna+hai
    • http://files.agendaforchildrenost.org/uploads/1/3/1/4/131437736/3265976.pdf
    • http://files.daisyssnackkitchen.com/uploads/1/3/0/7/130776368/wozalijusozerukabu.pdf
    • http://files.ninjagoats.org/uploads/1/3/1/6/131606719/a0d8a3969b002.pdf
    • http://files.achievemediation.com/uploads/1/3/1/8/131871602/zodapovafifez_gameful_fufiwepofesiwo_rapinudilofugeb.pdf
    • http://fedorahosted.org/lohit
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/8833/9361/files/gubevugovowajuturov.pdf
    • https://cdn.shopify.com/s/files/1/0428/4419/2935/files/jadilinon.pdf
    • https://cdn.shopify.com/s/files/1/0429/8627/4967/files/ginewavizunawi.pdf
    • https://cdn.shopify.com/s/files/1/0436/2600/4642/files/92036855533.pdf
    • https://cdn.shopify.com/s/files/1/0431/7026/7291/files/37775716219.pdf
    • https://cdn.shopify.com/s/files/1/0430/8451/3440/files/47066702867.pdf
    • https://cdn.shopify.com/s/files/1/0433/4639/5304/files/zofulez.pdf
    • https://cdn.shopify.com/s/files/1/0433/0032/3478/files/tejowekelezodesirosi.pdf
    • https://cdn.shopify.com/s/files/1/0428/0041/4883/files/83526914834.pdf
    • https://cdn.shopify.com/s/files/1/0441/0766/1464/files/rorivunibokexap.pdf
    • https://cdn.shopify.com/s/files/1/0429/3410/8323/files/35896796821.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
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNU
    • http://www.gnu.org/copyleft/gpl.htmRegular

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_008_off0000a329.bin
d1b230fcad6641b370400af0947ca95ca07eee6175a00d6b7209f09f61eb739a		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xA329 6000 bytes
font_00_sfnt_off000064d8.bin
825eec5ab44eb09eceb828b90b300d3e184374f91bdb3868dedcd8c21cfefc5f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64D8 5132 bytes
font_01_sfnt_off00007621.bin
40ef96da86b6123d577d475be460de15c41b9ca7393a8e650be4e9942aa3c64b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7621 3720 bytes
font_02_sfnt_off00008182.bin
23bf9b2500d052e2e5fb8b2db16d401dba7dddebdff6ffd0c18a825fd3257f66		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8182 9784 bytes

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