Malicious PDF — malware analysis report

Static analysis result for SHA-256 a62ba21272de7f94…

MALICIOUS

PDF

45.7 KB Created: 2020-07-29 06:45:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1b6a95f70cea77d48e0ad26aa2f4980f SHA-1: 6b3a6404d22b8291652d2c553ac8d37fafb4d83a SHA-256: a62ba21272de7f9400d92bae6c326794a19606e727d580821827927834a1f278
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with a critical heuristic firing indicating it's a malicious redirector link farm. The primary malicious URL identified is ttraff.ru, which is used to redirect to other potentially malicious or phishing sites. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the document's structure and embedded links strongly suggest a phishing or malware distribution attempt.

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=seismic+hydrocarbon+exploration+pdf
    • http://files.mrgillpe.com/uploads/1/3/0/7/130775375/9135907.pdf
    • http://files.cnpensioners.ca/uploads/1/3/1/1/131163780/390903d.pdf
    • http://files.runkidsrun.com/uploads/1/3/1/4/131437567/nimotodaxowa.pdf
    • http://files.ahealthyhomeplus.com/uploads/1/3/0/7/130775588/setufefigabudulipi.pdf
    • http://files.ahealthyhomeplus.c
    • https://cdn.shopify.com/s/files/1/0431/7596/8928/files/79709386448.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/73470001672.pdf
    • https://cdn.shopify.com/s/files/1/0432/3049/4878/files/22540603080.pdf
    • https://cdn.shopify.com/s/files/1/0434/5298/9605/files/71894328969.pdf
    • https://cdn.shopify.com/s/files/1/0431/9235/2932/files/wemebivu.pdf
    • https://cdn.shopify.com/s/files/1/0427/6705/7063/files/49083243708.pdf
    • https://cdn.shopify.com/s/files/1/0433/1690/4104/files/25809273309.pdf
    • https://cdn.shopify.com/s/files/1/0434/7537/0136/files/gotulukanawemiwutixab.pdf
    • https://cdn.shopify.com/s/files/1/0438/3201/7058/files/zakupafudiwepoj.pdf
    • https://cdn.shopify.com/s/files/1/0430/6301/7629/files/25863862816.pdf
    • https://cdn.shopify.com/s/files/1/0431/5506/2938/files/xirizabazobo.pdf
    • https://cdn.shopify.com/s/files/1/0429/8362/0757/files/54017561398.pdf
    • https://cdn.shopify.com/s/files/1/0432/8249/7696/files/75747322474.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_off000074cd.bin
f9243ae92732d4d75a69a7bbab0a9c58c2b1d1da31084705e26b33a3b5b70f81		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74CD 5596 bytes
font_01_sfnt_off000087a3.bin
a2bfe4a2eb0ba8d963642057d74e23da15a75760e735f8d5395fb2f3f16360bd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x87A3 9804 bytes

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