Malicious PDF — malware analysis report

Static analysis result for SHA-256 807749ae98879d3f…

MALICIOUS

PDF

52.2 KB Created: 2020-08-08 10:53:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2237af33189e6096645d207c9be08804 SHA-1: fedb608d06790241737123182db8e41ccd702cc4 SHA-256: 807749ae98879d3f6ab0f5fb0aaf03e49bf585516b346b996f8ac656aef52fc8
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with a critical heuristic firing for a malicious redirector. The primary malicious URL identified is https://ttraff.com/pify?keyword=anamnesis+pdf+para+ni%25C3%25B1os, which is likely used to funnel users to malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for human readability but rather to host the link farm. 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/pify?keyword=anamnesis+pdf+para+ni%25C3%25B1os
    • http://files.thestarchildmanifesto.com/uploads/1/3/1/3/131380759/0efec3073188d3.pdf
    • http://files.szynalsessions.com/uploads/1/3/0/7/130776462/jigisu.pdf
    • http://files.marryingbipolar.com/uploads/1/3/0/7/130776500/subov.pdf
    • http://files.aerinteriors.com/uploads/1/3/0/7/130776088/9055711.pdf
    • https://cdn.shopify.com/s/files/1/0429/4977/1427/files/anything_goes_song_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0434/0423/0805/files/44970326897.pdf
    • https://cdn.shopify.com/s/files/1/0436/9888/0680/files/lilaku.pdf
    • https://cdn.shopify.com/s/files/1/0433/0936/7454/files/udp_9._rarbg._me_2710_announce.pdf
    • https://cdn.shopify.com/s/files/1/0432/1204/6491/files/98454773611.pdf
    • https://cdn.shopify.com/s/files/1/0437/3417/1800/files/2983041191.pdf
    • https://cdn.shopify.com/s/files/1/0438/9643/8936/files/sewalubu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/benubojebexoreloruva.pdf
    • https://cdn.shopify.com/s/files/1/0446/6681/4617/files/ncert_english_grammar_book_for_class_12_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/9160/7190/files/49963611348.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/fejatomamegebuwugibuvu.pdf
    • https://cdn.shopify.com/s/files/1/0428/7820/6111/files/71524746796.pdf
    • https://cdn.shopify.com/s/files/1/0437/4567/3377/files/xml_package_r.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_off00008b11.bin
94bf5f859b2bf86e94a2bfb4970d8d3cd12ff46a6429aaf75bad68872f9e785a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B11 5356 bytes
font_01_sfnt_off00009cf8.bin
4a9c803e5a7bb2c25efe61ddd75347bdad8d00c2695ff9e9d479eceeecad1851		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9CF8 10884 bytes

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