Malicious PDF — malware analysis report

Static analysis result for SHA-256 7076e8561cd2d5c9…

MALICIOUS

PDF

41.5 KB Created: 2020-09-18 04:10:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 35eb2bdc83e456bbc7000a9b95d32ae8 SHA-1: ff2c42e0630e3becaee9934a4e6fd9d4b27bdb7a SHA-256: 7076e8561cd2d5c9e3f101b5b17b4709f53ffce3d4db14012b9c599ce457fe30
154 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to external PDF files hosted on various platforms. One prominent link, 'https://ttraff.me/wix?keyword=physical+science+textbook+high+school', is identified as a malicious redirector. This suggests the document is part of a link farm or SEO manipulation scheme designed to drive traffic to malicious infrastructure. The ML classifier also strongly indicated maliciousness.

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.me/wix?keyword=physical+science+textbook+high+school
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/3464/7460/files/how_to_remove_emoji_from_text_php.pdf
    • https://cdn.shopify.com/s/files/1/0434/5842/9089/files/menuluwesizuvigepogojag.pdf
    • https://cdn.shopify.com/s/files/1/0433/7329/7827/files/97066304659.pdf
    • https://cdn.shopify.com/s/files/1/0438/1566/5824/files/72712495125.pdf
    • https://0aebf99a-3b36-4ebd-b393-eb39845f9125.filesusr.com/ugd/3d0627_cd6163b377f848619e23fd93d855c494.pdf?index=true
    • https://aaae3763-2217-4799-926d-2464c670e026.filesusr.com/ugd/36d413_fa883490fb1647978c6fcf992363a12a.pdf?index=true
    • https://8daec82f-74e3-429f-89b2-6c0daa3eaee2.filesusr.com/ugd/08338c_c5f047c0dace4955bd5a6d3965402ed7.pdf?index=true
    • https://d3d8a330-9426-443a-82d9-509afb6ded24.filesusr.com/ugd/aff7ca_9fa93200150449e8b236cd81dd2b9470.pdf?index=true
    • https://cdn.shopify.com/s/files/1/0435/4444/5092/files/pupekagajepezuzazares.pdf
    • https://cdn.shopify.com/s/files/1/0432/3786/7687/files/anchorage_10_day_forecast.pdf
    • https://cdn.shopify.com/s/files/1/0441/4029/8392/files/nogojidi.pdf
    • https://cdn.shopify.com/s/files/1/0431/6689/2191/files/non_homogeneous_differential_equation_examples.pdf
    • https://38bff8c6-ee25-4f78-8e32-5c2010d8ef0b.filesusr.com/ugd/4cf28d_3b404d5ac00c485187e61d1055a57c2a.pdf?index=true
    • https://0904bb98-5d5d-47ac-ae5b-e6c3fb42ae3c.filesusr.com/ugd/1b0481_ed6b3c818556424dbdfe6ba07137ca1e.pdf?index=true
    • 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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000629f.bin
4ebc218a47128f4878854f78339097503a1178ba8fc42474641cb40fad3914d8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x629F 5340 bytes
font_01_sfnt_off000074dd.bin
650a122fd36d550323fefe7f20804e3a776eab24591cbcc8653e4565732dab3a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74DD 10520 bytes

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