Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4783bcf1f133503…

MALICIOUS

PDF

51.6 KB Created: 2020-08-21 17:22:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 02bc3f95d476a347f2801096e8baca3e SHA-1: f4a66bd1a609f4aabb1f3b0b0b310603bd5f9dd3 SHA-256: f4783bcf1f13350355b6c15cbff0b44d5b827dab8029eb30873d4f34c33758ec
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Phishing: Spearphishing Attachment T1059.001 Command and Scripting Interpreter: PowerShell

The PDF contains a malicious redirector link disguised as a free song download, aiming to lure users to a potentially harmful site. The PDF also hosts a large number of external links, many pointing to Shopify, which is characteristic of SEO link farm tactics. The ML classifier strongly supports the malicious classification.

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.com/pify?keyword=bts+butterfly+song+free
    • http://files.14weekends.com/uploads/1/3/0/9/130969469/gawuni-mutug-nuruduvijujixuv.pdf
    • http://wovadejij.kodachrome.net/uploads/1/3/1/4/131407558/lasomow.pdf
    • http://nejug.cumbriasculptors.com/uploads/1/3/1/6/131637814/pazoxizosujaxofarese.pdf
    • https://cdn.shopify.com/s/files/1/0431/4156/2522/files/nitro_rc_boats.pdf
    • https://cdn.shopify.com/s/files/1/0429/9803/8679/files/73671142574.pdf
    • https://cdn.shopify.com/s/files/1/0431/8281/7441/files/frases_basicas_en_ingles_y_su_pronunciacion.pdf
    • https://cdn.shopify.com/s/files/1/0437/7280/5277/files/puluregimazigamid.pdf
    • https://cdn.shopify.com/s/files/1/0433/9662/8641/files/30455766728.pdf
    • https://cdn.shopify.com/s/files/1/0428/3337/9484/files/dubagolipiwiziw.pdf
    • https://cdn.shopify.com/s/files/1/0430/2418/7549/files/16302690463.pdf
    • https://cdn.shopify.com/s/files/1/0432/6601/5396/files/benevolent_fund_form_kpk.pdf
    • https://cdn.shopify.com/s/files/1/0431/5371/9453/files/8917186126.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005e67.bin
d32e5d25f414dfff0af3e5e6dc759e6f28425a900b4c6868bfd121ff6a4a709d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E67 5900 bytes
font_01_sfnt_off0000725e.bin
804d5007b19c659a894548e56d7a34baaacadaf5a6ffd4fb45ce6ed1b8934e0e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x725E 4848 bytes
font_02_sfnt_off000082fa.bin
11b78aac9c42801a799e359b3c4242c7b9a6ab5259833657a2136b8f13cddc80		 pdf-font-stream PDF embedded font (sfnt) at offset 0x82FA 14924 bytes
font_03_sfnt_off0000b1cd.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB1CD 4324 bytes

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