Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e0db598f7d5735c…

MALICIOUS

PDF

43.5 KB Created: 2020-08-06 20:45:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 30b35d60937f72abf8265336b2043021 SHA-1: 812e69333d27544a903c157cb4e5408de4d3be44 SHA-256: 7e0db598f7d5735cf69457a19cdb53b11a9a7e163e3cb7ab6c7af2d41d913a89
152 Risk Score

Malware Insights

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

The PDF contains a link farm designed to redirect users to malicious content, specifically targeting a worksheet PDF lure. The primary malicious URL identified is https://ttraff.ru/pify?keyword=substitution+and+elimination+word+problems+worksheet+pdf, which acts as a redirector. The ML classifier strongly supports the malicious nature of this PDF.

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=substitution+and+elimination+word+problems+worksheet+pdf
    • http://files.testsiteforhsct.info/uploads/1/3/1/6/131636845/rusitelagu_rekep.pdf
    • http://fibugiwa.nicholeleavy.com/uploads/1/3/2/6/132695329/9473238.pdf
    • http://files.tylerstracks.com/uploads/1/3/1/6/131636903/bixevalizureke.pdf
    • http://depotiro.machining-technology.com/uploads/1/3/0/9/130969723/d79905a7d9eb5e.pdf
    • http://ligiriwu.islandretreatcleaninganddesign.com/uploads/1/3/2/6/132681556/5652807.pdf
    • https://cdn.shopify.com/s/files/1/0434/5040/0928/files/zeloxasifopa.pdf
    • https://cdn.shopify.com/s/files/1/0429/4931/2665/files/antrenmanlarla_matematik_3.pdf
    • https://cdn.shopify.com/s/files/1/0429/9502/4025/files/34838711211.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/rejukimuvili.pdf
    • https://cdn.shopify.com/s/files/1/0430/7438/8119/files/85630171838.pdf
    • https://cdn.shopify.com/s/files/1/0434/3404/9703/files/wezarakabidifujagudijij.pdf
    • https://cdn.shopify.com/s/files/1/0432/0994/9341/files/mubomawa.pdf
    • https://cdn.shopify.com/s/files/1/0433/8774/8519/files/appropriate_by_branden_jacobs_jenkins.pdf
    • https://cdn.shopify.com/s/files/1/0439/9883/8942/files/dakovisunibaviwegaza.pdf
    • https://cdn.shopify.com/s/files/1/0435/2393/2311/files/33258263825.pdf
    • https://cdn.shopify.com/s/files/1/0434/2353/1175/files/3210078100.pdf
    • https://cdn.shopify.com/s/files/1/0431/4782/1212/files/daxibop.pdf
    • https://cdn.shopify.com/s/files/1/0431/0951/5413/files/19453093268.pdf
    • https://cdn.shopify.com/s/files/1/0435/4929/4756/files/android_file_download_example.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_off00006a28.bin
2175cadb18d45d991a366a52f4a501c72aac8b85f88bddad5c1507ea674f7b1d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A28 5680 bytes
font_01_sfnt_off00007d53.bin
c9d17e47188abc2cded922c48d13c04fb5dab0e40b94e8cf1e807646682c488b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D53 10360 bytes

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