Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ee4dee44e28f211…

MALICIOUS

PDF

42.8 KB Created: 2020-08-09 03:15:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c7235712ddcccabfa24d4b2c56fcad82 SHA-1: 67ab9bed4a3e1b8d8bb9936ab505445fa3797b59 SHA-256: 4ee4dee44e28f2115f058d31f53cb77d7b45b4938ac0a3d9b9769ed9fb127d5d
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of embedded links, many of which point to a link farm hosted on Shopify, ultimately redirecting to a malicious URL. The primary heuristic indicates a malicious redirector link, and the ML classifier strongly supports maliciousness. The document body, though heavily obfuscated, contains the malicious URL and appears to be a lure for 'personal pronouns exercises'.

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=personal+pronouns+exercises+pdf+elementary
    • http://files.jhuxster.com/uploads/1/3/1/6/131636834/tetevuzikizido.pdf
    • http://files.kgibbonscreativeaid.com/uploads/1/3/1/8/131872107/8478294.pdf
    • http://livezupi.briannadipilato.com/uploads/1/3/0/7/130738970/gamin.pdf
    • http://files.nickschumacher.org/uploads/1/3/0/9/130969678/jegujowugipefuz-sexefusodaju-ramedenewe.pdf
    • http://sewuxo.virginiarlca.org/uploads/1/3/1/8/131857631/3774607.pdf
    • https://cdn.shopify.com/s/files/1/0433/4754/2175/files/kivasiwovugabof.pdf
    • https://cdn.shopify.com/s/files/1/0438/6340/8795/files/wujozexexagipikarew.pdf
    • https://cdn.shopify.com/s/files/1/0433/6294/3144/files/gulotimu.pdf
    • https://cdn.shopify.com/s/files/1/0447/8858/0512/files/blame_it_on_the_boogie_lyrics.pdf
    • https://cdn.shopify.com/s/files/1/0437/6117/2631/files/dovobapaxugarulefi.pdf
    • https://cdn.shopify.com/s/files/1/0440/0332/8150/files/mc_helicopter_mod.pdf
    • https://cdn.shopify.com/s/files/1/0433/5108/1114/files/wajuwanetevunofedul.pdf
    • https://cdn.shopify.com/s/files/1/0428/8629/9815/files/bwv_1007_violin.pdf
    • https://cdn.shopify.com/s/files/1/0432/5117/1478/files/42576547376.pdf
    • https://cdn.shopify.com/s/files/1/0434/7851/5864/files/85528198966.pdf
    • https://cdn.shopify.com/s/files/1/0431/9654/7230/files/45929028840.pdf
    • https://cdn.shopify.com/s/files/1/0431/0699/2289/files/74052398410.pdf
    • https://cdn.shopify.com/s/files/1/0432/6942/3257/files/13011749163.pdf
    • https://cdn.shopify.com/s/files/1/0427/6633/6167/files/leripegi.pdf
    • https://cdn.shopify.com/s/files/1/0431/0315/8433/files/rotojujebifipon.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/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005b21.bin
f22ee7472124c01a20a66988d1b63d106c49bc71909d20665bed47b1aa3211a5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B21 5356 bytes
font_01_sfnt_off00006d44.bin
3a620df3011728be162260ca043e6c90f79dcc95f7b582415e0fbf6e137975c3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D44 10020 bytes
font_02_sfnt_off00008f9b.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8F9B 4324 bytes

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