Malicious PDF — malware analysis report

Static analysis result for SHA-256 157577cdd08b325b…

MALICIOUS

PDF

44.6 KB Created: 2020-07-30 20:24:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 2c3ca4aed9f3d191f3c9db876022b92a SHA-1: 63a5ed032aa3b6cdb4e3f1bb15b135b92902a823 SHA-256: 157577cdd08b325bfa8a285232529b9c0c872e2fb116036081a492b61aa1a810
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains embedded links that redirect to malicious infrastructure, specifically identified by the 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristic. The document body, though heavily obfuscated, suggests a lure related to a 'Schwerbehindertenausweis' (disability pass) application, indicating a phishing or social engineering pretext. The presence of numerous external PDF links further supports the classification as a link farm, often used to distribute malware or conduct phishing campaigns.

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=schwerbehindertenausweis+antrag+pdf+bayern In PDF document text
    • http://files.easyhomestore668.com/uploads/1/3/1/4/131408572/c9748fe40760fa5.pdfIn PDF document text
    • http://files.destinyaurora.net/uploads/1/3/0/7/130775092/7630843.pdfIn PDF document text
    • http://files.solutionstailored.com/uploads/1/3/0/7/130775820/nexapemazaxozax_razig_kekagatajopepu_pilira.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/4219/4083/files/segogu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/8118/6971/files/89857559847.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/7143/9001/files/wumagumazukolewesedinif.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/vojinanekarab.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/0980/8280/files/44454909952.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/9362/2935/files/91077520999.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8789/6482/files/vakumedevosakojo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/8922/2037/files/39901175774.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/5453/7624/files/15489708358.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/4351/2732/files/99547894250.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/9814/4932/files/zemorezageniriwa.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006c13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6C13 5596 bytes
SHA-256: c0954a28de5f62f0a073e4f329f37664eeb6a2655f95e507399d91d3c980c2fb
font_01_sfnt_off00007f28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7F28 11016 bytes
SHA-256: 753ea778212c8bba6db2f7abefbe3a20b51ac3266103ca3e023c2e8532a4b568

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