Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f83ecbc36d5773c…

MALICIOUS

PDF

45.2 KB Created: 2020-08-10 22:07:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9a84e49e9a8fa80acf64badbf7b736cc SHA-1: 2830cc0364d125ff631fce152975f19e90168369 SHA-256: 9f83ecbc36d5773c9c664d5ddb9e80c367cb8852d8af139cad4836781f37c51f
150 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one identified as a malicious redirector. The document body is heavily obfuscated but appears to contain the same URLs. This suggests a link farm or SEO spam campaign designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=carte+apicultura+pdf
    • http://files.ucdavisclimbing.com/uploads/1/3/1/0/131069899/8737500.pdf
    • http://files.anniesresalefortheworld.org/uploads/1/3/2/6/132682335/jadeginududi.pdf
    • http://samol.fbcfnh.com/uploads/1/3/2/7/132712207/nijogaw.pdf
    • http://files.schombergcommunityfarm.ca/uploads/1/3/1/3/131380868/c3c31a37f78ec7.pdf
    • http://files.theroadsidestand.com/uploads/1/3/1/3/131379650/7867270.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/sovir.pdf
    • https://cdn.shopify.com/s/files/1/0432/3259/2040/files/88721873873.pdf
    • https://cdn.shopify.com/s/files/1/0434/3096/9511/files/95607621180.pdf
    • https://cdn.shopify.com/s/files/1/0433/4508/4574/files/68416668594.pdf
    • https://cdn.shopify.com/s/files/1/0432/5205/6227/files/79711599186.pdf
    • https://cdn.shopify.com/s/files/1/0431/0417/4233/files/rabakarurowozazozum.pdf
    • https://cdn.shopify.com/s/files/1/0430/1769/9477/files/luvefaz.pdf
    • https://cdn.shopify.com/s/files/1/0434/2756/1634/files/voiced_and_voiceless_sounds_chart.pdf
    • https://cdn.shopify.com/s/files/1/0430/7825/4745/files/bunch_of_thoughts_in_marathi_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0435/5283/3687/files/chrome_flags_experimental.pdf
    • https://cdn.shopify.com/s/files/1/0431/7259/3820/files/28162797237.pdf
    • https://cdn.shopify.com/s/files/1/0435/6525/2771/files/african_queen_lyrics.pdf
    • https://cdn.shopify.com/s/files/1/0434/4630/4920/files/63519392386.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_off000069c1.bin
5ace6503ca4a35d1531b8b979fd1724cb9912bd73e55d78cb4bbabb082e4a787		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69C1 4876 bytes
font_01_sfnt_off00007a65.bin
2a00064765bbea6ffbcd6b18764620aff6152542cf6534c105088cabd2bbb002		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A65 14688 bytes

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