Malicious PDF — malware analysis report

Static analysis result for SHA-256 09a1939c75ffc031…

MALICIOUS

PDF

39.2 KB Created: 2020-08-18 23:52:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4241ba544741a231560b54ea8a95feef SHA-1: 7d6bfcfe2310151c69b067e549df6a0ba86ea239 SHA-256: 09a1939c75ffc031d9cf736f30fab4eb7a73ac8c244d964d90f81a90d896b46f
154 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which points to a known malicious redirector. The document body, though heavily obfuscated, contains text related to 'information reporting system' and the malicious URL. The presence of numerous other PDF links suggests a link farm or redirection attempt, likely to deliver a secondary payload or phish for credentials.

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.cc/pify?keyword=information+reporting+system+adalah
    • http://palimale.goldkeel.com/uploads/1/3/0/8/130814328/witedituviduxi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/2449/8343/files/penepudanaxiburudaled.pdf
    • https://cdn.shopify.com/s/files/1/0433/9433/4869/files/23612894980.pdf
    • https://cdn.shopify.com/s/files/1/0454/8493/3272/files/school_building_plans.pdf
    • https://cdn.shopify.com/s/files/1/0427/8249/0791/files/76696850265.pdf
    • https://cdn.shopify.com/s/files/1/0436/5385/7433/files/5127497973.pdf
    • https://cdn.shopify.com/s/files/1/0439/6656/2462/files/11962774781.pdf
    • https://cdn.shopify.com/s/files/1/0436/5778/9593/files/pevusezenumonamawire.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zitadeduwifugegumav.pdf
    • https://cdn.shopify.com/s/files/1/0429/5750/4668/files/programming_in_ansi_c_7th_edition_book.pdf
    • https://cdn.shopify.com/s/files/1/0436/1289/7437/files/somebejitepotibe.pdf
    • https://cdn.shopify.com/s/files/1/0429/9161/6153/files/bohemian_rhapsody_piano_scribd.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_off00005b70.bin
bd53df5e3ae5cbe86b233206819f68067327d968102541bd511b7167c61d90d7
pdf-font-stream PDF embedded font (sfnt) at offset 0x5B70 5492 bytes
font_01_sfnt_off00006df3.bin
f9c1560ef5ee5646ded0c4bce3ae64c52ad8f2e2739b757e06f4a44bf745fa7c
pdf-font-stream PDF embedded font (sfnt) at offset 0x6DF3 9520 bytes