Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f6334d12151d3f9…

MALICIOUS

PDF

44.7 KB Created: 2020-08-06 12:20:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4b0f86b65b7b9acfd2ac44f6ab5f5ddc SHA-1: a3f404c97216c13fe2761894ceab5b5fa635b1cd SHA-256: 5f6334d12151d3f96bcbc56b0a6260a04719493e18e542d89d1e363046b739fa
154 Risk Score

Malware Insights

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

This PDF document contains a link to a known malicious redirector, ttraff.cc, which is likely used to obscure the final destination of the malicious payload. The document also exhibits characteristics of a link farm, embedding numerous external PDF links, many of which point to Shopify domains. The primary malicious link is https://ttraff.cc/pify?keyword=blink+malcolm+gladwell+book+pdf, which is presented as a lure for a book download.

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=blink+malcolm+gladwell+book+pdf
    • http://files.stpaulpublicschools.org/uploads/1/3/1/3/131380343/2315924.pdf
    • http://files.southforkwatershed.org/uploads/1/3/1/3/131384429/mifibepabi_muvokama_fimamarim_nibunonij.pdf
    • http://files.heaterpcbrepair.com/uploads/1/3/0/8/130815014/d0140e167f2ca6.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/6435/1130/files/73628443685.pdf
    • https://cdn.shopify.com/s/files/1/0432/2079/5556/files/32842238844.pdf
    • https://cdn.shopify.com/s/files/1/0434/7058/6006/files/87287507853.pdf
    • https://cdn.shopify.com/s/files/1/0430/2408/9242/files/fepawokorurovizidobogivom.pdf
    • https://cdn.shopify.com/s/files/1/0432/8305/4757/files/phproxy_url_forms.pdf
    • https://cdn.shopify.com/s/files/1/0433/6245/1611/files/application_form_sample_for_job.pdf
    • https://cdn.shopify.com/s/files/1/0433/9433/4869/files/61758431301.pdf
    • https://cdn.shopify.com/s/files/1/0431/0574/7108/files/assessment_format.pdf
    • https://cdn.shopify.com/s/files/1/0434/0521/3847/files/62653532580.pdf
    • https://cdn.shopify.com/s/files/1/0438/4686/0960/files/husky_power_washer_1800_psi.pdf
    • https://cdn.shopify.com/s/files/1/0434/7687/7478/files/coagulant_and_anticoagulant.pdf
    • https://cdn.shopify.com/s/files/1/0437/3020/6885/files/ccna_200_125_book_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0430/4669/9165/files/gevijibosi.pdf
    • https://cdn.shopify.com/s/files/1/0432/8266/1526/files/gemujuwuk.pdf
    • https://cdn.shopify.com/s/files/1/0438/1474/8322/files/pojogoxosiwimilodeweno.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006fc8.bin
3c430c1147151af0a8ff4270696c075b116a8795512b9fb41c1cbe753b2d8b32		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6FC8 5544 bytes
font_01_sfnt_off000082aa.bin
50248c7180c30292748974da64cbba257bf68724c25d119d6a0627c297e5b4fe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x82AA 10284 bytes

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