Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e53e2fdf3ee0d1c…

MALICIOUS

PDF

42.6 KB Created: 2020-08-28 09:12:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 98711c9d338a7b73bf19d72157d6fc71 SHA-1: 1d712a33cd50b73315b34de84201356becf9c6f3 SHA-256: 2e53e2fdf3ee0d1cabd230005b2b1fb7de54ba301d96419ac657246b9a4b4bd5
150 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external resources. One critical heuristic identified a link to a known malicious redirector, ttraff.me, which is likely used to obscure the final malicious destination. The document body, though heavily obfuscated, contains the same URL, suggesting it is the primary lure. The presence of numerous other links, many hosted on Shopify, suggests a link farm or SEO poisoning technique to increase the visibility of the malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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/pify?keyword=icd+10+code+for+incision+and+drainage+of+perirectal+abscess
    • http://niziri.thelellowfoundation.org/uploads/1/3/2/3/132302868/d7af05eacc14.pdf
    • http://nakulare.brandito.net/uploads/1/3/0/7/130776008/c0512094658.pdf
    • https://cdn.shopify.com/s/files/1/0427/9628/6111/files/wevosulixonaki.pdf
    • https://cdn.shopify.com/s/files/1/0434/5259/6374/files/58451354250.pdf
    • https://cdn.shopify.com/s/files/1/0429/9276/3039/files/verbes_en_er_au_present_exercices_a.pdf
    • https://cdn.shopify.com/s/files/1/0427/7954/1671/files/57936892783.pdf
    • https://cdn.shopify.com/s/files/1/0428/4973/0727/files/41094286419.pdf
    • https://cdn.shopify.com/s/files/1/0429/2021/4681/files/72618325887.pdf
    • https://cdn.shopify.com/s/files/1/0433/8355/4202/files/69567799328.pdf
    • https://cdn.shopify.com/s/files/1/0434/8693/7250/files/recombinant_dna_genes_and_genomes.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/14192803693.pdf
    • https://cdn.shopify.com/s/files/1/0435/6702/2239/files/mosudiwomomerujogew.pdf
    • https://cdn.shopify.com/s/files/1/0433/8860/0478/files/ditajazudezafamuxuzebogij.pdf
    • https://cdn.shopify.com/s/files/1/0431/5090/1402/files/sharon_lear_guideway_financial.pdf
    • https://cdn.shopify.com/s/files/1/0432/5530/0249/files/wagimux.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_off00005ea5.bin
4fbebc3c8f563354b68a0c78f4d3ae5bb4180b0554f094d822a3a1827e231181		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5EA5 5596 bytes
font_01_sfnt_off000071b1.bin
d56ca3ef2b56efc6ea9094f9ae1a548225118743bae593d4dc48d51b693d10d6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71B1 14056 bytes

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