Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb54ed6b1311f23f…

MALICIOUS

PDF

46.3 KB Created: 2020-07-09 04:07:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f82be30d07f0219924afdd6388092605 SHA-1: db12bd9df0f32538b099ccff439c2da0217aa325 SHA-256: fb54ed6b1311f23ffca32c28cb96bce4e4af04d35a4eecf63273cab4e488f1c5
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, masquerading as a worksheet answer key, which are designed to redirect users to malicious sites. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK specifically flags the link to ttraff.com, indicating a known malicious redirector. The PDF_SEO_LINK_FARM heuristic indicates a large number of external PDF links, suggesting a link farm used for SEO poisoning or distributing further malicious content. No scripts were extracted from this sample.

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/wb?keyword=comparing%20fractions%20worksheet%204th%20grade%20answers
    • http://files.kumanokodoguides.com/uploads/1/3/0/7/130776003/releweba.pdf
    • http://files.ritandbob.com/uploads/1/3/1/1/131163563/5478e9452eca78a.pdf
    • http://files.busybeeorganize.ca/uploads/1/3/0/9/130969004/gojebifazalomo-maxurapokenoxo.pdf
    • http://files.godayschool.com/uploads/1/3/0/8/130873830/fdc5e61e30.pdf
    • http://files.annieyoon.com/uploads/1/3/1/3/131380998/fixew_wugusu.pdf
    • http://files.manhattanhope.com/uploads/1/3/1/4/131454024/kizan_jogesatovimafo.pdf
    • http://files.thehighanxietyrunner.com/uploads/1/3/0/8/130814529/5341b0ba.pdf
    • http://files.jennyfinkelyoga.com/uploads/1/3/1/0/131070379/lomupumirap-sodubuwofesakef.pdf
    • http://files.golfclubmd.com/uploads/1/3/1/4/131408528/sidexagolopikodagi.pdf
    • http://files.bingocompany.net/uploads/1/3/1/3/131379612/d2857f2095895b.pdf
    • https://juxatafisatu.files.wordpress.com/2020/06/jijeketuluro.pdf
    • https://neguxesejog.files.wordpress.com/2020/07/vujet.pdf
    • https://wejofokil.files.wordpress.com/2020/06/1233120925.pdf
    • https://firusomu.files.wordpress.com/2020/07/96478341274.pdf
    • https://dagatosi.files.wordpress.com/2020/07/91642633581.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/98973723668.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/gefoviliruvowej.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/45927795399.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/12729031526.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_off000076fa.bin
24f8a1cb38cbbb53e1e89ba17c52f1db2be446d003d550525dfbed30fa85e1b0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x76FA 5592 bytes
font_01_sfnt_off000089e9.bin
d4d340ffe1324a1dbe31edec009ab01cceeb34d557060f0720082fa31b61e9d3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x89E9 9956 bytes

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