Malicious PDF — malware analysis report

Static analysis result for SHA-256 50ee19297dc924da…

MALICIOUS

PDF

46.6 KB Created: 2020-07-18 19:04:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 175fbd7b52ea2ad33ae9679fade3b3df SHA-1: 5556928d00ede9dcb70590018330460d1ff36dd1 SHA-256: 50ee19297dc924da6e135a0e95d0eb70f58664e90179353a8f12342d628e7196
152 Risk Score

Malware Insights

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

This PDF file contains multiple embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, appears to be related to 'statistics interview questions and answers pdf', suggesting a lure to trick users into clicking the malicious link. The ML classifier strongly flagged this PDF as malicious, and the presence of a link farm further supports a malicious intent.

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/wb?keyword=statistics%20interview%20questions%20and%20answers%20pdf
    • http://files.wordoflifemn.org/uploads/1/3/1/3/131398250/vaxizesole.pdf
    • http://files.eframesuk.com/uploads/1/3/2/6/132680867/dd3054ef.pdf
    • http://files.mauibeachvillarentals.com/uploads/1/3/0/9/130969545/dejevenatej.pdf
    • http://files.mauibeachvillarentals.com/uploads/1/3/0/9/130969545/dejevena
    • https://xokiwija.files.wordpress.com/2020/06/nobakesujokozatumekuwurug.pdf
    • https://basopejimip.files.wordpress.com/2020/06/88586685813.pdf
    • https://mifowoxar.files.wordpress.com/2020/07/jowajusog.pdf
    • https://wubigixetoso.files.wordpress.com/2020/06/33679083044.pdf
    • https://kuroluf.files.wordpress.com/2020/07/72480527869.pdf
    • https://janavitim807994190.files.wordpress.com/2020/07/18316652554.pdf
    • https://badupegenum.files.wordpress.com/2020/06/budupitazevisotokil.pdf
    • https://zuvutipabog.files.wordpress.com/2020/07/23096587569.pdf
    • https://cdn.shopify.com/s/files/1/0431/8108/0738/files/sukodabafo.pdf
    • https://cdn.shopify.com/s/files/1/0435/1708/3803/files/debodenawiv.pdf
    • https://cdn.shopify.com/s/files/1/0430/7409/3217/files/lesunisaxi.pdf
    • https://cdn.shopify.com/s/files/1/0431/4519/9784/files/fajoxikovexaxewa.pdf
    • https://cdn.shopify.com/s/files/1/0431/3153/5524/files/lipotufubarotopuz.pdf
    • https://cdn.shopify.com/s/files/1/0429/8683/2035/files/2996283436.pdf
    • https://cdn.shopify.com/s/files/1/0432/3183/8368/files/38069928627.pdf
    • https://cdn.shopify.com/s/files/1/0434/5279/2982/files/mugiz.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000764e.bin
d7b6075d80a494bc23eb70d38d4ab82d221a1f35c8cecee570a73553b5018729		 pdf-font-stream PDF embedded font (sfnt) at offset 0x764E 5380 bytes
font_01_sfnt_off000088a5.bin
29844c0110e17fb1cd036b0aed9f7f381ec99bc7ff5511a211dd8dada359cf49		 pdf-font-stream PDF embedded font (sfnt) at offset 0x88A5 10512 bytes

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