Malicious PDF — malware analysis report

Static analysis result for SHA-256 20cfe0c2a6fb7d6d…

MALICIOUS

PDF

104.2 KB Created: 2020-08-04 03:37:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 092497426c909cac252c61c871dd699b SHA-1: b16b4c88a06884a541a65630be777372b6199169 SHA-256: 20cfe0c2a6fb7d6d77e94a19a2a1e3d83aa24a6cc595f157819cb83cdd129aa1
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 a link farm hosted on Shopify. One of the primary links redirects to a malicious URL via 'ttraff.cc', suggesting a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains the search query 'Walden Thoreau PDF English', indicating a lure to disguise the malicious intent. The ML classifier strongly flagged this PDF as malicious.

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=walden+thoreau+pdf+english
    • http://paziz.thehandbagcompany.org/uploads/1/3/0/7/130738666/gavodewif-wowazetef-midoputefasakad-poduloxewo.pdf
    • http://files.brandjourno.com/uploads/1/3/0/8/130813054/pigedotipomisodam.pdf
    • http://files.echoescollective.com/uploads/1/3/2/7/132740234/nusijivot.pdf
    • https://cdn.shopify.com/s/files/1/0427/8150/7740/files/pupibaz.pdf
    • https://cdn.shopify.com/s/files/1/0429/1434/9215/files/lajevivewizozawipokunek.pdf
    • https://cdn.shopify.com/s/files/1/0429/5717/6986/files/76429244495.pdf
    • https://cdn.shopify.com/s/files/1/0430/4856/6941/files/71470630783.pdf
    • https://cdn.shopify.com/s/files/1/0435/5253/8787/files/27172530517.pdf
    • https://cdn.shopify.com/s/files/1/0433/6405/7238/files/5923975257.pdf
    • https://cdn.shopify.com/s/files/1/0431/2757/0596/files/effective_business_and_professional_writing.pdf
    • https://cdn.shopify.com/s/files/1/0432/5661/0979/files/48771680181.pdf
    • https://cdn.shopify.com/s/files/1/0436/6001/7814/files/autopage_remote_start.pdf
    • https://cdn.shopify.com/s/files/1/0432/0428/0481/files/73070789992.pdf
    • https://cdn.shopify.com/s/files/1/0430/1442/2687/files/41393581054.pdf
    • https://cdn.shopify.com/s/files/1/0434/2258/0886/files/29908786700.pdf
    • https://cdn.shopify.com/s/files/1/0429/1641/3607/files/xamozosalibun.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/dedagefegumam.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_off00015942.bin
f1f4a484e259a072cb22fafe76aa12d9919a0b54d9d39238b4365a2cff89a79c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15942 5316 bytes
font_01_sfnt_off00016b60.bin
951644b502cc91130b589a91dff8294622562388049e45f3647830c3d6734354		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16B60 12076 bytes

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