Malicious PDF — malware analysis report

Static analysis result for SHA-256 867238d7530148b7…

MALICIOUS

PDF

41.9 KB Created: 2020-08-11 07:57:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3a0b170e9b696a5532098b55b9b2082f SHA-1: 96e0dadf1ebb34836b9cafba945577fccd48df0c SHA-256: 867238d7530148b7ffa460a2a4b2bb5a85c750807d4a9ccb8f76859e0b04c58c
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link T1059.001 PowerShell

The PDF file contains a link that redirects to a known malicious domain, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains text suggesting a lure for a "batch script tutorial pdf download". The PDF_SEO_LINK_FARM heuristic indicates a large number of outbound links, many hosted on Shopify, suggesting a link farm used for SEO manipulation to drive traffic to malicious sites. The ML_NYX_PDF_MALICIOUS heuristic strongly flags the document as malicious.

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.ru/pify?keyword=batch+script+tutorial+pdf+download
    • http://dovobak.dynamicsdanceinc.com/uploads/1/3/1/6/131636725/5327646.pdf
    • http://files.elizabethkpetersonlab.com/uploads/1/3/1/3/131384789/sibufajoj-xuvini.pdf
    • http://files.brewhousebulldogs.com/uploads/1/3/0/7/130776619/fobobegizemotuw-rawijutiva-nezomabutak.pdf
    • https://cdn.shopify.com/s/files/1/0429/7677/2250/files/nakefufekobavupina.pdf
    • https://cdn.shopify.com/s/files/1/0437/9171/2405/files/gangsta_granny_free.pdf
    • https://cdn.shopify.com/s/files/1/0439/3671/0824/files/68006726790.pdf
    • https://cdn.shopify.com/s/files/1/0432/6309/9040/files/dezutagujixizus.pdf
    • https://cdn.shopify.com/s/files/1/0434/1304/5398/files/love_notes_for_him.pdf
    • https://cdn.shopify.com/s/files/1/0431/2930/7293/files/48744461414.pdf
    • https://cdn.shopify.com/s/files/1/0429/2775/1321/files/wekalipuxukoxo.pdf
    • https://cdn.shopify.com/s/files/1/0429/1775/7095/files/angielski_w_tumaczeniach_business_3_chomikuj.pdf
    • https://cdn.shopify.com/s/files/1/0434/6911/1449/files/mijipekude.pdf
    • https://cdn.shopify.com/s/files/1/0428/4389/8019/files/gimafubowup.pdf
    • https://cdn.shopify.com/s/files/1/0436/9429/3142/files/60704482623.pdf
    • https://cdn.shopify.com/s/files/1/0432/4874/6651/files/lanric_cable_tray_catalogue.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_off00006310.bin
17d6383f349fde1d21db6ceebff40e6a0bf4538aeefa4e06f508fbbacf4a3cae		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6310 5384 bytes
font_01_sfnt_off00007568.bin
c19ed7dbc79bca7b334f5fa7114fe91a3bcba4a46e3d244c57682a0310c6ed62		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7568 10968 bytes

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