Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fff201426627e5b…

MALICIOUS

PDF

43.1 KB Created: 2020-08-04 21:05:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 12308484eb71103eb1ca9a92a4b12152 SHA-1: f83569ee95b2e1e71499dc2a7661e5936e32e16d SHA-256: 1fff201426627e5b1f91de5ba2d19ad4b92a9adc0aedf3f5007aa8bfacdecd0f
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.ru, which is disguised as a worksheet. The document body, though heavily obfuscated, also contains this URL and numerous other links to potentially malicious domains hosted on various subdomains. The presence of a link farm and a malicious redirector strongly suggests a phishing or malware distribution attempt.

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=ordering+fractions+from+least+to+greatest+worksheet+pdf
    • http://wufitofa.buckinghamcharitycup.co.uk/uploads/1/3/0/8/130814769/4a7c4.pdf
    • http://files.sunnyhillpreschoolinc.com/uploads/1/3/1/4/131453251/2e4567d.pdf
    • http://files.coaster-net.com/uploads/1/3/0/7/130775286/dowore_fitidajajajitok_sevik_vuzuwewaxopo.pdf
    • http://files.ponahealth.com/uploads/1/3/1/1/131164519/vesatoserudebekipap.pdf
    • http://files.stthomasnewton.net/uploads/1/3/0/8/130813796/b36241609c7cdac.pdf
    • https://cdn.shopify.com/s/files/1/0434/1081/7180/files/most_used_word_in_english.pdf
    • https://cdn.shopify.com/s/files/1/0430/7661/6346/files/10130645490.pdf
    • https://cdn.shopify.com/s/files/1/0430/3824/5017/files/kiruxizajigevadupitapo.pdf
    • https://cdn.shopify.com/s/files/1/0437/3970/9589/files/fedadop.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/jufozigazagapuji.pdf
    • https://cdn.shopify.com/s/files/1/0432/2358/0839/files/43039660446.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/74535711799.pdf
    • https://cdn.shopify.com/s/files/1/0437/9944/5664/files/css_transform_rotate.pdf
    • https://cdn.shopify.com/s/files/1/0432/2931/5229/files/ximidikeputaranozulotadox.pdf
    • https://cdn.shopify.com/s/files/1/0428/9911/2095/files/16831079199.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_off00005bc6.bin
5e55e71fdcd6ce789bea60653cab49d27b0de293e78a9a65e5c5be254487858d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5BC6 5540 bytes
font_01_sfnt_off00006e84.bin
d15ee63fd7c892da0a2b73a08669d2a0ed88e4f9ed386a6f40c27396928947c6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E84 9956 bytes
font_02_sfnt_off000090a3.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x90A3 4324 bytes

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