Malicious PDF — malware analysis report

Static analysis result for SHA-256 1163d9cc560368f7…

MALICIOUS

PDF

40.9 KB Created: 2020-08-04 07:43:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 63d84afa72161f897059c5587423c65f SHA-1: 7c05c1a147f92e744085c6063ae9698bc856cc49 SHA-256: 1163d9cc560368f7178d431795ea149f3354f913372a02ca5c6e4c1f82d5c3ad
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to external resources, including a known malicious redirector at 'ttraff.ru'. This suggests a link farm or phishing attempt designed to direct users to malicious sites. The ML classifier also strongly indicated maliciousness.

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=problem+solving+skill+pdf
    • http://files.knightsautowash.com/uploads/1/3/1/4/131453904/kufufolufikal.pdf
    • http://files.elginparkathletics.com/uploads/1/3/1/4/131406413/xikudenaw.pdf
    • http://files.learntoroar.com/uploads/1/3/2/3/132303378/torovitisaxibegesewa.pdf
    • http://files.lincolncommunityleague.org/uploads/1/3/0/9/130969966/2988f9962e64.pdf
    • http://files.tiffanymckenzie.com/uploads/1/3/0/8/130874488/ba210aecf6e60.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0436/2466/1154/files/xudulujoj.pdf
    • https://cdn.shopify.com/s/files/1/0435/0499/2408/files/os_x_snow_leopard_iso.pdf
    • https://cdn.shopify.com/s/files/1/0434/1514/2551/files/gupolenivubo.pdf
    • https://cdn.shopify.com/s/files/1/0432/0650/8701/files/vugigeremududujilejesapi.pdf
    • https://cdn.shopify.com/s/files/1/0434/8890/3325/files/85748300135.pdf
    • https://cdn.shopify.com/s/files/1/0430/6986/6141/files/welesepomobavijewilaki.pdf
    • https://cdn.shopify.com/s/files/1/0431/0512/4516/files/bufoxagokulixixigiru.pdf
    • https://cdn.shopify.com/s/files/1/0431/4670/7104/files/employment_news_27_july_2020.pdf
    • https://cdn.shopify.com/s/files/1/0430/8706/9335/files/pudixifetojup.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/91300886864.pdf
    • https://cdn.shopify.com/s/files/1/0436/3180/4574/files/79898220718.pdf
    • https://cdn.shopify.com/s/files/1/0433/1523/2921/files/pixusofex.pdf
    • https://cdn.shopify.com/s/files/1/0427/4978/8327/files/tejojurenenav.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_off000062ca.bin
7a620a88a20dc139067614ae3cafbddefdc86cabdaa715763e2a153bce9d69af		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62CA 5416 bytes
font_01_sfnt_off00007527.bin
2d1900a490f107b36cf93029f64dfc55033d421b63397621e9432268cb735708		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7527 9820 bytes

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