Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ea91675663a3c17…

MALICIOUS

PDF

44.2 KB Created: 2020-08-11 13:15:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ce55290d6f0a141020a1b1a8d9c519ae SHA-1: 1ea672c3e03957bc8554b0b7d531f9e9a298c8b1 SHA-256: 4ea91675663a3c177ebdbe7436e81fd08d3e821870356ba9bb45fd0b100ba028
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Phishing: Spearphishing Attachment T1204.002 Malicious File: Malicious Link

The PDF contains a large number of embedded links, many of which point to Shopify domains but are likely part of a link farm designed to improve search engine rankings for malicious content. One critical heuristic identified a direct link to a known malicious redirector infrastructure at 'ttraff.ru'. The document body, though heavily obfuscated, contains references to the malicious URL and other PDF links, suggesting a lure to external, potentially harmful, content.

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=basics+of+anesthesia+pdf+download
    • http://files.westfielddentalpa.com/uploads/1/3/0/7/130775942/bavef_kezujuwusuk_javexolizepun.pdf
    • http://nibarus.ladybugranchllc.com/uploads/1/3/1/4/131483068/8841645.pdf
    • http://files.jlkarchitecturaldesign.com/uploads/1/3/0/7/130775632/juwapenanidi.pdf
    • https://cdn.shopify.com/s/files/1/0431/7731/2411/files/vojitapimuvijoti.pdf
    • https://cdn.shopify.com/s/files/1/0428/9685/1111/files/fool_for_your_loving_tab.pdf
    • https://cdn.shopify.com/s/files/1/0434/9257/3334/files/jijege.pdf
    • https://cdn.shopify.com/s/files/1/0440/2829/7381/files/what_is_the_tp_command_in_minecraft.pdf
    • https://cdn.shopify.com/s/files/1/0433/8080/1701/files/lakak.pdf
    • https://cdn.shopify.com/s/files/1/0427/5548/9948/files/44524792318.pdf
    • https://cdn.shopify.com/s/files/1/0433/2381/8139/files/68259516773.pdf
    • https://cdn.shopify.com/s/files/1/0428/8043/4342/files/towezuturipejomup.pdf
    • https://cdn.shopify.com/s/files/1/0428/8937/9993/files/pizomofinoduta.pdf
    • https://cdn.shopify.com/s/files/1/0431/2412/9952/files/94980849518.pdf
    • https://cdn.shopify.com/s/files/1/0450/7946/2040/files/adobe_to_word_converter_software.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/tugomedimugatusigoxafif.pdf
    • https://cdn.shopify.com/s/files/1/0430/0088/9507/files/autodesk_fusion_360_black_book.pdf
    • https://cdn.shopify.com/s/files/1/0431/6761/3089/files/71326124424.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006570.bin
862f17d2bee6aee8980f5667575b61e24ecb018ab97e281134c3b30f5e368193		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6570 5288 bytes
font_01_sfnt_off0000776d.bin
e9a5a1f6ed95b1e3669933bb00002ad32a1708c3e0b735191cad5e02368a6c7d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x776D 1800 bytes
font_02_sfnt_off00007ffb.bin
3579bcdfa8c7d25da62a6a00a87ff496d2401158b2cc5bc98c1181a9300f9daa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7FFB 10420 bytes

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