Malicious PDF — malware analysis report

Static analysis result for SHA-256 57fb217447c733d7…

MALICIOUS

PDF

41.5 KB Created: 2020-08-20 06:09:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 113a565e3ebc57ff86e15fb88aa94154 SHA-1: 0cba9d183d1c3198907f688504c70db27f9c82f9 SHA-256: 57fb217447c733d74dbcbae5532c35ea631b8aa23b23e9e5841df0af3e8e3853
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded links, with a critical heuristic firing for a malicious redirector. The primary malicious URL, https://ttraff.com/pify?keyword=adobe+photoshop++for+pc+windows+xp, is designed to lure users to potentially harmful content. The document body, though heavily obfuscated, contains references to software downloads, reinforcing the lure. 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.com/pify?keyword=adobe+photoshop++for+pc+windows+xp
    • http://files.nickstvs.com/uploads/1/3/1/8/131856279/bosinoku.pdf
    • http://files.janetbelsky.net/uploads/1/3/1/4/131407572/wukitiguleve_zoxeses_nawimixo_kibakonag.pdf
    • http://files.thehillchristianfellowship.com/uploads/1/3/1/3/131381553/0e1518b285c.pdf
    • http://files.nualacenter.com/uploads/1/3/2/6/132695505/082c6339518fb.pdf
    • https://cdn.shopify.com/s/files/1/0433/3764/6245/files/47547219936.pdf
    • https://cdn.shopify.com/s/files/1/0431/5214/6587/files/86048784680.pdf
    • https://cdn.shopify.com/s/files/1/0429/9004/3285/files/xogumevifiposij.pdf
    • https://cdn.shopify.com/s/files/1/0435/0833/4751/files/javascript_date_format_am_pm.pdf
    • https://cdn.shopify.com/s/files/1/0433/9240/1558/files/lubowepirimisumapimix.pdf
    • https://cdn.shopify.com/s/files/1/0429/8434/1657/files/zemobetufofito.pdf
    • https://cdn.shopify.com/s/files/1/0436/9104/9115/files/game_karne_ka_tarika_computer_me.pdf
    • https://cdn.shopify.com/s/files/1/0429/0599/3375/files/pukimemirorebatuf.pdf
    • https://cdn.shopify.com/s/files/1/0433/9249/9877/files/rexesebewolonose.pdf
    • https://cdn.shopify.com/s/files/1/0431/8127/7342/files/sugubukoxukitinuxupoj.pdf
    • https://cdn.shopify.com/s/files/1/0436/5815/0046/files/borders_for_word_documents.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000064eb.bin
b6dbb751b702aea6c72def05e553ca397b77a283ad4be5797af4e5d1a721a399
pdf-font-stream PDF embedded font (sfnt) at offset 0x64EB 5292 bytes
font_01_sfnt_off000076f9.bin
74ce85188904684a6cfbf0bcaa9b56ad97620c4277da5cba13ab432ecd0fb627
pdf-font-stream PDF embedded font (sfnt) at offset 0x76F9 10040 bytes