Malicious PDF — malware analysis report

Static analysis result for SHA-256 b230c594520d7d6e…

MALICIOUS

PDF

43.0 KB Created: 2020-08-12 03:03:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f09428ff70a9ebd31119c4f006afce39 SHA-1: 6524499495fce9dffedb5c34f74d6005732627d6 SHA-256: b230c594520d7d6e6279d81f378a71f5dee05812cbd48b22ea7c8da0966a8a69
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.cc, disguised as a song chords PDF. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the URL and appears to be a lure for the user to click the malicious link.

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=you+shook+me+all+night+long+chords+pdf
    • http://files.hardawayart.com/uploads/1/3/1/4/131453253/a605d.pdf
    • http://files.justinkhughes.com/uploads/1/3/0/7/130775151/koferowuzad-luvexotek.pdf
    • http://mebinagi.kinfolknetwork.com/uploads/1/3/0/7/130776265/vorapirexizosezemiro.pdf
    • http://files.contewesthills.net/uploads/1/3/1/8/131872105/7398086.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/nifafujejugafux.pdf
    • https://cdn.shopify.com/s/files/1/0430/6547/5226/files/centroid_formula_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0430/9480/2589/files/8557271060.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xokuwunojuvilil.pdf
    • https://cdn.shopify.com/s/files/1/0432/0513/2456/files/dilopibaji.pdf
    • https://cdn.shopify.com/s/files/1/0428/7227/5103/files/3983770781.pdf
    • https://cdn.shopify.com/s/files/1/0429/9603/9839/files/xujerusevixivewulisipit.pdf
    • https://cdn.shopify.com/s/files/1/0434/3015/0296/files/84933262423.pdf
    • https://cdn.shopify.com/s/files/1/0429/8339/1395/files/wezumudidapazarefuvajej.pdf
    • https://cdn.shopify.com/s/files/1/0432/1420/9186/files/30174574800.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/12509012650.pdf
    • https://cdn.shopify.com/s/files/1/0427/4031/8375/files/how_to_unfollow_on_facebook.pdf
    • https://cdn.shopify.com/s/files/1/0430/8136/7712/files/lilaxesefirotipotox.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_off00005041.bin
ed536e12eaea118131f322553b5885bab4de573a96e59385703707b737dd4669		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5041 5476 bytes
font_01_sfnt_off000062b1.bin
9446ff99d9f8df53857cb218f8c0c66f96a4300cce65ca3c8a3b92b0ba3a6bf2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62B1 14288 bytes
font_02_sfnt_off00008f4d.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8F4D 4324 bytes

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