Malicious PDF — malware analysis report

Static analysis result for SHA-256 d056c9c2eec6ab6d…

MALICIOUS

PDF

33.7 KB Created: 2020-08-05 21:00:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a4bcebd1c09c44b1bc50981d47510973 SHA-1: 9c77d5de1dd8c11b7f5434785e81d1cb3a24f7e8 SHA-256: d056c9c2eec6ab6d0d320dfd1c7356f84974f60edff4fa584faf06c47ddb0c70
150 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to domains associated with SEO link farms, designed to obscure malicious redirectors. One critical heuristic identified a link to a known malicious redirector at 'https://ttraff.com/wb?keyword=vector%20addition%20and%20subtraction%20worksheet%20pdf'. The document body, though heavily obfuscated, contains text related to 'vector addition and subtraction worksheet pdf', suggesting a lure to disguise the malicious intent. The ML classifier strongly supports the malicious verdict.

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.com/wb?keyword=vector%20addition%20and%20subtraction%20worksheet%20pdf
    • http://files.theturquoisepalms.com/uploads/1/3/0/7/130776291/771643.pdf
    • http://files.faithutah.com/uploads/1/3/1/4/131483343/6805518.pdf
    • http://files.gsjministries.com/uploads/1/3/0/7/130776573/935417.pdf
    • http://files.schaumburgpaintingpros.com/uploads/1/3/1/4/131453251/xuwerimijafuse_tusix.pdf
    • https://cdn.shopify.com/s/files/1/0432/5320/3102/files/gebefakenomu.pdf
    • https://cdn.shopify.com/s/files/1/0427/9782/6207/files/sejaridenozukinofago.pdf
    • https://cdn.shopify.com/s/files/1/0435/6905/3854/files/76958613178.pdf
    • https://cdn.shopify.com/s/files/1/0435/8576/5533/files/35182602973.pdf
    • https://cdn.shopify.com/s/files/1/0431/8648/7455/files/logubilipuwosopakig.pdf
    • https://cdn.shopify.com/s/files/1/0431/0938/4343/files/asciidoc_to.pdf
    • https://cdn.shopify.com/s/files/1/0433/1785/4373/files/42786147530.pdf
    • https://cdn.shopify.com/s/files/1/0431/8491/4583/files/gomatajonagekirizoj.pdf
    • https://cdn.shopify.com/s/files/1/0433/6871/0300/files/sawadomef.pdf
    • https://cdn.shopify.com/s/files/1/0434/3506/5505/files/13294330963.pdf
    • https://cdn.shopify.com/s/files/1/0427/9032/2342/files/45123605864.pdf
    • https://cdn.shopify.com/s/files/1/0436/8993/5002/files/monkey_madness_osrs.pdf
    • https://cdn.shopify.com/s/files/1/0443/8907/3062/files/hebrew_bible_translation_to_english.pdf
    • https://cdn.shopify.com/s/files/1/0429/5668/5468/files/fofefi.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_off000047a6.bin
a5dcb2f5bd3a90d600774ef46a468e1d8217c2449f5a6571c30f1150e0bd84a7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x47A6 5472 bytes
font_01_sfnt_off00005a53.bin
d13582b5ee0f0dd91ec583a0e4efb930303cbb2533c4f6e9e86997e0575d0f91		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5A53 9064 bytes

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