Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e9c5e620cec000a…

MALICIOUS

PDF

44.8 KB Created: 2020-07-15 02:29:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e750b20251662922eac190d8af1892a0 SHA-1: 1cc0c5e0de6dba0659d58eae796bb489ab73bbbc SHA-256: 0e9c5e620cec000a397029a85d384deaeb5cfc661622e4f166fcb174738e789e
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF document contains a large number of embedded links, many of which point to external PDF files hosted on various domains. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' indicates that at least one of these links directs to known malicious infrastructure. The ML classifier also strongly flagged this PDF as malicious. The document body appears to be obfuscated or corrupted, preventing a clear understanding of its specific lure, but the sheer volume of links suggests a link farm or SEO poisoning tactic to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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/wb?keyword=violencia%20intrafamiliar%20causas%20pdf
    • http://files.stillwaterswellness.org/uploads/1/3/0/7/130775231/8aef32a7a8c4.pdf
    • http://files.beatlesliverpoolandmore.com/uploads/1/3/1/4/131453486/befugot.pdf
    • http://files.mycannablissonline.com/uploads/1/3/0/7/130776401/5115539.pdf
    • http://files.gabicurless.com/uploads/1/3/2/3/132303373/3095314.pdf
    • http://files.newleaforganizingllc.com/uploads/1/3/1/8/131857071/6418065.pdf
    • http://files.sweetcloverrabbitry.com/uploads/1/3/1/4/131438439/zalowakoja-somokafogof-posajosotum-ropesukeguk.pdf
    • http://files.edisonhighcheer.com/uploads/1/3/0/7/130775665/kosojovirunuwa_risoja.pdf
    • http://files.my-agency-site.com/uploads/1/3/1/3/131380126/5302026.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://karutetok765055257.files.wordpress.com/2020/07/vuzozigozu.pdf
    • https://gojepideg.files.wordpress.com/2020/06/tiwopoderukevedomate.pdf
    • https://fewagab.files.wordpress.com/2020/06/40998086943.pdf
    • https://janekepegoku.files.wordpress.com/2020/07/2791078542.pdf
    • https://cdn.shopify.com/s/files/1/0432/8184/2341/files/8094815901.pdf
    • https://cdn.shopify.com/s/files/1/0427/9926/8003/files/64561360388.pdf
    • https://cdn.shopify.com/s/files/1/0431/1767/4656/files/dediwu.pdf
    • https://cdn.shopify.com/s/files/1/0430/8362/8708/files/6917176215.pdf
    • https://cdn.shopify.com/s/files/1/0432/2738/1924/files/91640128045.pdf
    • https://cdn.shopify.com/s/files/1/0431/9071/4532/files/42753159147.pdf
    • https://cdn.shopify.com/s/files/1/0429/7372/4825/files/56686915972.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_off00007033.bin
d67a1245422736e5edfa7fc98b9a9278dcf7462f6cbc3d6f543c9cd6d7f766fb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7033 5148 bytes
font_01_sfnt_off00008199.bin
2752e102fae0af1dc881eb011c6bad5f7935849f6772c9a05cd14a48459afde6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8199 10596 bytes

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