Malicious PDF — malware analysis report

Static analysis result for SHA-256 841ee5ed77560fa1…

MALICIOUS

PDF

41.6 KB Created: 2020-08-28 06:14:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c7b291e677a66f5967296becf5e1661a SHA-1: 5659459a66cdd62b6cf8e8ca7ad014448c8da8d4 SHA-256: 841ee5ed77560fa101a9a5eadad04df390f20a47f55ff5037596e71ed3c34f2c
152 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded links, many of which point to Shopify domains hosting other PDFs. One prominent link, however, directs to a known malicious redirector at 'ttraff.ru'. The document body, though heavily obfuscated, contains text suggesting it is related to 'handwriting worksheets for first graders', likely a lure to entice users to click the malicious link. The presence of multiple PDF links and a malicious redirector suggests a link farm or SEO poisoning attack designed to drive traffic to malicious infrastructure.

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=handwriting+worksheets+for+first+graders
    • http://files.silvabuilt.com/uploads/1/3/0/7/130775515/ruzesobiwep.pdf
    • http://files.yessicacurielmontoya.com/uploads/1/3/0/7/130739601/873f84d336ce.pdf
    • https://cdn.shopify.com/s/files/1/0432/6876/7907/files/apbn_2017_kemenkeu.pdf
    • https://cdn.shopify.com/s/files/1/0432/4173/4311/files/tokabizaxulewebovenake.pdf
    • https://cdn.shopify.com/s/files/1/0429/6956/3290/files/29926764696.pdf
    • https://cdn.shopify.com/s/files/1/0440/0264/0030/files/aris_gallios_chicago.pdf
    • https://cdn.shopify.com/s/files/1/0430/7176/6690/files/33299120191.pdf
    • https://cdn.shopify.com/s/files/1/0433/5638/9528/files/twilight_syndrome_english_patch.pdf
    • https://cdn.shopify.com/s/files/1/0429/2454/0071/files/telododowiniwo.pdf
    • https://cdn.shopify.com/s/files/1/0449/9944/2590/files/double_cardan_joint.pdf
    • https://cdn.shopify.com/s/files/1/0434/5836/3544/files/autonomy_in_medical_ethics.pdf
    • https://cdn.shopify.com/s/files/1/0436/9825/8074/files/nigexopapalogelamejop.pdf
    • https://cdn.shopify.com/s/files/1/0438/1392/9122/files/plantillas_portadas_para_word_formales.pdf
    • https://cdn.shopify.com/s/files/1/0435/6263/1326/files/pdf_to_word_converter_download_for_windows.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_off000055cb.bin
b50e2c4a66ccfc0336417b21cdced43be8c6dd6cd5909970bd112ecc9738adb1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x55CB 5040 bytes
font_01_sfnt_off000066f5.bin
2a7fc9a01d28d49bc8e293b32ea7f49d8ec0e19537f34d5b6f88349164ec5ab0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x66F5 10708 bytes
font_02_sfnt_off00008b59.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B59 4324 bytes

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