Malicious PDF — malware analysis report

Static analysis result for SHA-256 72bea498293f2168…

MALICIOUS

PDF

47.9 KB Created: 2020-08-02 15:01:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4306ec6d794407a65292c13a01580634 SHA-1: a812e6fe6cca2f9e33400bed9050a3871d809d91 SHA-256: 72bea498293f216831a0f3c7b59b1d698ad56271984f0a082ad707caea0153ed
194 Risk Score

Malware Insights

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

The PDF contains numerous links, with one specifically pointing to a known malicious redirector. The document body, though obfuscated, contains text related to a 'chris bryant ccna study guide pdf' and a URL that appears to be part of a link farm designed to attract search engine traffic. The ML classifier strongly indicates maliciousness, and the presence of external links suggests an attempt to redirect the user to malicious infrastructure.

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/pify?keyword=chris+bryant+ccna+study+guide+pdf
    • http://files.scottishwheelchaircurling.com/uploads/1/3/0/7/130775228/3a26326e1.pdf
    • http://files.fcalynn.org/uploads/1/3/1/6/131637631/pobulopu-fiwudesow.pdf
    • http://files.shawneecabinets.com/uploads/1/3/1/3/131382583/dulutorefopipaf.pdf
    • http://files.bestmusicteacherever.com/uploads/1/3/0/7/130776065/d1becc61fc2b55d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0440/0339/3694/files/dokkan_battle_resurrection_f.pdf
    • https://cdn.shopify.com/s/files/1/0437/3400/7973/files/lufufevez.pdf
    • https://cdn.shopify.com/s/files/1/0433/8139/1514/files/kigudulonafupape.pdf
    • https://cdn.shopify.com/s/files/1/0431/3822/0181/files/15869779581.pdf
    • https://cdn.shopify.com/s/files/1/0435/7849/1041/files/97086717595.pdf
    • https://cdn.shopify.com/s/files/1/0431/6377/9240/files/najosijukukukijomupife.pdf
    • https://cdn.shopify.com/s/files/1/0428/2338/5247/files/javubigutefimerakaw.pdf
    • https://cdn.shopify.com/s/files/1/0429/1503/7351/files/19592106001.pdf
    • https://cdn.shopify.com/s/files/1/0433/1631/4277/files/90185055854.pdf
    • https://cdn.shopify.com/s/files/1/0430/3434/5625/files/17986655661.pdf
    • https://cdn.shopify.com/s/files/1/0428/8099/1388/files/niwefe.pdf
    • https://cdn.shopify.com/s/files/1/0432/3957/1611/files/ninalipunikowirobezavidet.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006d96.bin
48d0804634fa6be04b6edf931014909a439e573eb33fe0977ecbd390b173773e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D96 5420 bytes
font_01_sfnt_off00007ffd.bin
1e2dc2103733b77915d0e0a3660c00ed9a3372614911cff6ff05ab252d0a0c39		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7FFD 10684 bytes
font_02_sfnt_off0000a4a2.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA4A2 4324 bytes

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