Malicious PDF — malware analysis report

Static analysis result for SHA-256 f97839c3f2039e1c…

MALICIOUS

PDF

42.8 KB Created: 2020-08-14 18:44:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ccd810103bb5fbf393055475808fcd81 SHA-1: 1e0b9fe2003adc0ca60722b48155e3d30c9cf76c SHA-256: f97839c3f2039e1cb870e8ad519d65d5cfae9765fcbf028482168c72ff3c0b21
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a link to a known malicious redirector, ttraff.cc, which is designed to lead users to malicious sites. The document body, though partially corrupted, contains text related to a 'bursary application form' and the malicious URL, suggesting a phishing or scam lure. The presence of numerous embedded links, many pointing to Shopify domains hosting PDFs, indicates a link farm strategy to improve search engine ranking and distribute malicious content. The ML classifier strongly supports the malicious verdict.

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.cc/pify?keyword=bowman%2527+s+bursary+application+form+pdf
    • http://jikojosup.robynroscoe.com/uploads/1/3/1/6/131606201/nitum_duborapakire_fuxabuxulukax.pdf
    • http://files.actionsportsracing.com/uploads/1/3/2/6/132695586/rugirewoxamum_zibijigij.pdf
    • http://files.moonspellgirl.com/uploads/1/3/1/0/131070934/4926231.pdf
    • http://files.mauihighchorus.com/uploads/1/3/1/4/131453171/7026016.pdf
    • https://cdn.shopify.com/s/files/1/0427/8353/9366/files/vipobumawebib.pdf
    • https://cdn.shopify.com/s/files/1/0432/3033/1040/files/52363844325.pdf
    • https://cdn.shopify.com/s/files/1/0434/1720/6949/files/zixafuxiz.pdf
    • https://cdn.shopify.com/s/files/1/0437/5986/1912/files/statistics_terms.pdf
    • https://cdn.shopify.com/s/files/1/0435/0096/1947/files/gagivujixose.pdf
    • https://cdn.shopify.com/s/files/1/0431/3966/1981/files/curriculum_development_in_second_language_teaching.pdf
    • https://cdn.shopify.com/s/files/1/0437/4121/6929/files/wabux.pdf
    • https://cdn.shopify.com/s/files/1/0427/4490/5884/files/17472693757.pdf
    • https://cdn.shopify.com/s/files/1/0429/3168/3484/files/animisme_dan_dinamisme.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/90142435821.pdf
    • https://cdn.shopify.com/s/files/1/0433/0664/7717/files/59580169807.pdf
    • https://cdn.shopify.com/s/files/1/0437/3122/2682/files/funopijufererike.pdf
    • https://cdn.shopify.com/s/files/1/0431/6187/8687/files/xopozivaxajet.pdf
    • https://cdn.shopify.com/s/files/1/0431/0230/6468/files/botanica_oculta_paracelso.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_off000065c3.bin
ef9c3aa41b7636fe9abd17f35f65e8feedbcaf143ee9cf2836483ea62df6a657		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65C3 5716 bytes
font_01_sfnt_off0000792f.bin
d3a47b94a4cf7fec3f1e925b8dbd7d849313883fbb285e06f32de00814b9f6f1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x792F 10828 bytes

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