Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e16aee1502ed802…

MALICIOUS

PDF

42.0 KB Created: 2020-08-10 17:28:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f1cf52eb572913d3637ed2a40a7dbf8a SHA-1: ce778a16a9deaee14d863a5f9eecba68172ab92a SHA-256: 1e16aee1502ed8022c0472b89f1851b625469e30b57aa8e7d2b04646e171d952
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing indicating a redirector link to 'ttraff.ru'. This suggests the document's primary purpose is to lure users to malicious sites. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the presence of multiple external links, including a suspicious redirector, points to a social engineering attack.

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=comparison+and+contrast+exercises+pdf
    • http://kixosom.nscwritingcenter.com/uploads/1/3/1/1/131164250/7482503.pdf
    • http://files.travellingscot.co.uk/uploads/1/3/0/7/130775977/gofex.pdf
    • http://files.brurosa.com/uploads/1/3/0/7/130775129/nagof_milerobowe_xezirujatiwep.pdf
    • http://files.rickbirley.com/uploads/1/3/1/4/131413678/8fd2f5e8ffa8a2.pdf
    • https://cdn.shopify.com/s/files/1/0432/1699/4466/files/69041296114.pdf
    • https://cdn.shopify.com/s/files/1/0432/0306/8068/files/95104474851.pdf
    • https://cdn.shopify.com/s/files/1/0434/5597/1492/files/71505550439.pdf
    • https://cdn.shopify.com/s/files/1/0430/2451/5235/files/46629568605.pdf
    • https://cdn.shopify.com/s/files/1/0431/3032/3095/files/unidades_de_almacenamiento_de_datos.pdf
    • https://cdn.shopify.com/s/files/1/0447/6112/0919/files/balance_de_comprobacion_definicion.pdf
    • https://cdn.shopify.com/s/files/1/0437/7001/9994/files/java_8_interview_questions_and_answers_for_experienced.pdf
    • https://cdn.shopify.com/s/files/1/0431/2625/9876/files/jatulipozusurujokum.pdf
    • https://cdn.shopify.com/s/files/1/0431/0722/1670/files/78066772390.pdf
    • https://cdn.shopify.com/s/files/1/0440/6591/5032/files/the_illustrated_man_summary.pdf
    • https://cdn.shopify.com/s/files/1/0431/6289/4498/files/ginupi.pdf
    • https://cdn.shopify.com/s/files/1/0428/9495/0556/files/banapebanuxapefo.pdf
    • https://cdn.shopify.com/s/files/1/0431/8648/7455/files/9085354682.pdf
    • https://cdn.shopify.com/s/files/1/0440/1935/1710/files/korunopekisebawi.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_off000066dc.bin
8b235978f9d9198f0afc51b619123d273c83cf59dfbe12954d19643dbb6a15ff		 pdf-font-stream PDF embedded font (sfnt) at offset 0x66DC 5244 bytes
font_01_sfnt_off00007892.bin
c82cb96a218ac2508d8b556e06080ece2c2747fdc00e95972f21acdd89e0c6da		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7892 10060 bytes

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