Malicious PDF — malware analysis report

Static analysis result for SHA-256 874e3ab5d288a94a…

MALICIOUS

PDF

39.2 KB Created: 2020-08-12 07:52:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5dc89146cff9fe3f50bec88fd6ea4da6 SHA-1: 3884bdca61716ea9e9e419d6be69812baa7965af SHA-256: 874e3ab5d288a94ab4e344bae882f67c7e36478d420d10f59f8f23a21465c119
194 Risk Score

Malware Insights

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

The PDF contains numerous links, with one identified as a malicious redirector pointing to 'https://ttraff.com/pify?keyword=headway+elementary+third+edition+workbook+pdf'. The presence of a large number of external PDF links, many hosted on Shopify, suggests an attempt to create a link farm or distribute content through compromised sites. The heuristic 'SE_LOLBIN_RUN_COMMAND' firing with 'powershell_create_admin_user.pdf' and 'http://files.holistic-resea' indicates potential execution of commands or download of further payloads.

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=headway+elementary+third+edition+workbook+pdf
    • http://files.holistic-research.org/uploads/1/3/1/3/131383284/fatunogeno-dubefupapetaf-xuxibufu.pdf
    • http://files.lux4light.com/uploads/1/3/1/4/131407918/vexevupimetoti-fepuwaga-gepugiz-junugupore.pdf
    • http://files.horizonmusicedson.com/uploads/1/3/1/4/131437834/gotuvulifopawu-geluxevedaku-pusefewajud.pdf
    • http://buloma.deanvukelicstonemason.com/uploads/1/3/2/6/132682897/dujolegufoloj-nidevoriwegom-tetajeso.pdf
    • http://files.purelyinbound.com/uploads/1/3/1/3/131398231/kadesukewab.pdf
    • http://files.holistic-resea
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/3064/1829/files/nifula.pdf
    • https://cdn.shopify.com/s/files/1/0450/3139/1396/files/13040009821.pdf
    • https://cdn.shopify.com/s/files/1/0432/2335/1458/files/juraxutagorizogabipofi.pdf
    • https://cdn.shopify.com/s/files/1/0428/5346/6271/files/tobasuvopi.pdf
    • https://cdn.shopify.com/s/files/1/0432/5238/3904/files/windows_10_powershell_create_admin_user.pdf
    • https://cdn.shopify.com/s/files/1/0434/0357/5454/files/popcap_games_alchemy.pdf
    • https://cdn.shopify.com/s/files/1/0429/7896/7703/files/lugukino.pdf
    • https://cdn.shopify.com/s/files/1/0432/9770/2046/files/vagukanipepetutalovix.pdf
    • https://cdn.shopify.com/s/files/1/0435/2563/6248/files/dexilesituxiwetade.pdf
    • https://cdn.shopify.com/s/files/1/0430/3545/9738/files/mubibubakag.pdf
    • https://cdn.shopify.com/s/files/1/0432/1280/0168/files/urbanisasi_di_indonesia.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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004644.bin
1768ebb02dd4428912cf30c114b0b667e0c6ac4d58885ed0fc62163fd1c83fd6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4644 5464 bytes
font_01_sfnt_off000058b9.bin
fd472165ea21af1bafc2f05067ac6c9e669f46a5777e7c6b4b2ef2c288ef19c1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x58B9 9736 bytes
font_02_sfnt_off00007a3e.bin
a95eff378c135b1ab40d10b3cd1da1bafbc07f86005f57898d079c90d712ddbd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A3E 16204 bytes

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