Malicious PDF — malware analysis report

Static analysis result for SHA-256 9712d0a6604bd338…

MALICIOUS

PDF

41.6 KB Created: 2020-08-23 19:15:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 141e8e0062b0cc4185a89573ee849e8b SHA-1: 2cde1719aa675acc7e2798d9fb34ab7656cbb936 SHA-256: 9712d0a6604bd3383e71067048b2e4cb49b0204882e6427336ed1848fb149b9d
152 Risk Score

Malware Insights

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

The PDF contains embedded links, with one pointing to a known malicious redirector. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the URL that is also present in the heuristics, suggesting a lure for a worksheet to mask malicious redirection.

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=static+electricity+worksheet+pdf
    • http://files.earlysvilleexchange.org/uploads/1/3/2/6/132695629/moruzajuxapi.pdf
    • https://cdn.shopify.com/s/files/1/0432/5244/9435/files/nisugomadobu.pdf
    • https://cdn.shopify.com/s/files/1/0438/4541/9165/files/human_body_anatomy.pdf
    • https://cdn.shopify.com/s/files/1/0445/9141/5460/files/lopressor_davis_drug_guide.pdf
    • https://cdn.shopify.com/s/files/1/0431/8802/7555/files/merit_badge_worksheet_personal_management.pdf
    • https://cdn.shopify.com/s/files/1/0437/7808/0925/files/it_s_not_a_fashion_statement_lyrics.pdf
    • https://cdn.shopify.com/s/files/1/0432/5398/9534/files/59973154877.pdf
    • https://cdn.shopify.com/s/files/1/0433/7680/3990/files/69574190420.pdf
    • https://cdn.shopify.com/s/files/1/0431/0417/4233/files/gadavakelabiju.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_off0000589b.bin
3bc43583baeac3857dc81ff6321962363518d8ec9a0d307b4217b9eb39f251d4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x589B 5284 bytes
font_01_sfnt_off00006aac.bin
1eb131862a41e083d5c10e4f258b20c30976c5f71243833b3980f8f5211266fd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6AAC 9684 bytes
font_02_sfnt_off00008bc5.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8BC5 4324 bytes

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