Malicious PDF — malware analysis report

Static analysis result for SHA-256 03a99a6c62424d72…

MALICIOUS

PDF

41.2 KB Created: 2020-08-17 00:57:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8f11c96433d497d4471f0a99708995cc SHA-1: f61ad3178228a8737dcd15f5f603ae1a31322f8e SHA-256: 03a99a6c62424d7234d0c2b81969f0e878583c23e0a61c20206dd8908a6eeee1
162 Risk Score

Malware Insights

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

The PDF contains embedded URLs, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains text suggesting a lure for a 'blank nid card psd file' and includes the malicious URL. The presence of numerous external PDF links, many hosted on Shopify, suggests a link farm or SEO poisoning attempt to distribute malicious content. No scripts were extracted, but the overall structure and URL reputation point to a phishing or malware distribution attempt.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=blank+nid+card+psd+file
    • http://files.tallywood.com/uploads/1/3/0/8/130874160/rerujifoxomalu-toxabefo-vatuzegawevuxi-venaputom.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/3062/5950/files/75563526259.pdf
    • https://cdn.shopify.com/s/files/1/0429/2198/4166/files/fobenewasakufafelukux.pdf
    • https://cdn.shopify.com/s/files/1/0432/9711/2219/files/70476609799.pdf
    • https://cdn.shopify.com/s/files/1/0429/1559/4393/files/gukukotu.pdf
    • https://cdn.shopify.com/s/files/1/0434/4102/9276/files/66963328.pdf
    • https://cdn.shopify.com/s/files/1/0438/3100/1250/files/katyusha_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0432/1483/1780/files/canteen_management_system_project_documentation.pdf
    • https://cdn.shopify.com/s/files/1/0438/2870/7488/files/ejercicios_de_caida_libre_y_lanzamiento_vertical_resueltos.pdf
    • https://cdn.shopify.com/s/files/1/0434/1907/4712/files/hashmi_biochemistry_mcqs.pdf
    • https://cdn.shopify.com/s/files/1/0432/0005/3408/files/23870588240.pdf
    • https://cdn.shopify.com/s/files/1/0430/1943/6195/files/jelededosiri.pdf
    • https://cdn.shopify.com/s/files/1/0432/9114/8454/files/mijavinepube.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005d25.bin
3c57700dde99441474dad84e3fa98c928c5ffa639796c2e52b5d6bdc62dad89e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D25 5260 bytes
font_01_sfnt_off00006f12.bin
e6f890c0d1b63b7f27624dad4bc8c67188635cbaa882f11a9cf1766f2f3424e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F12 13068 bytes

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