Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3c254b036dda57b…

MALICIOUS

PDF

47.7 KB Created: 2020-07-27 02:52:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d5a276f813dfc2bed765babe7d6f46c5 SHA-1: 49fd4476665dec9b73dcee1ea133b87653bcc8db SHA-256: e3c254b036dda57baba33be93ddd8b35314d38c2b0969ea36896add24c5e6d1d
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one specifically pointing to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, appears to be a lure related to academic notes, likely intended to trick users into clicking the malicious links. No scripts were extracted, limiting the analysis of direct payload execution.

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.com/wb?keyword=advanced%20microprocessor%20lecture%20notes%20pdf
    • http://files.kaikalanortherninuits.com/uploads/1/3/1/1/131164095/nenozoluxu-wokojisuku-jobenexoje-xudigijepumu.pdf
    • http://files.mrgona.com/uploads/1/3/2/6/132682768/fadezevep-kateses.pdf
    • http://files.mayolivestock.com/uploads/1/3/1/3/131379231/kanizajojev.pdf
    • http://files.oakleighminiatures.co.uk/uploads/1/3/1/4/131437623/8254795.pdf
    • http://files.dryvettefit.com/uploads/1/3/2/3/132303151/jokaguponijufimi.pdf
    • https://cdn.shopify.com/s/files/1/0434/7543/5677/files/nenodojasi.pdf
    • https://cdn.shopify.com/s/files/1/0436/1479/7981/files/posemu.pdf
    • https://cdn.shopify.com/s/files/1/0434/0056/0805/files/pimebifejotokulavegij.pdf
    • https://cdn.shopify.com/s/files/1/0430/4325/8522/files/41365694872.pdf
    • https://cdn.shopify.com/s/files/1/0429/8371/9071/files/nisafufafuliv.pdf
    • https://cdn.shopify.com/s/files/1/0432/6889/8966/files/vapekof.pdf
    • https://cdn.shopify.com/s/files/1/0432/4386/4228/files/22681096622.pdf
    • https://cdn.shopify.com/s/files/1/0437/1621/4939/files/banis.pdf
    • https://cdn.shopify.com/s/files/1/0428/7997/5590/files/kugudolel.pdf
    • https://cdn.shopify.com/s/files/1/0432/8351/3494/files/kenorixavukuno.pdf
    • https://cdn.shopify.com/s/files/1/0440/5025/1941/files/dulimukirajulolumedavo.pdf
    • https://cdn.shopify.com/s/files/1/0430/0875/3827/files/6675475117.pdf
    • https://cdn.shopify.com/s/files/1/0436/1525/6738/files/junofasogonebusaregu.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_off00006e37.bin
fb451bbc4861a07d953af081205770f957e0b29406effac7760ac8685a4e9db0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E37 5232 bytes
font_01_sfnt_off00007fe5.bin
280ec7902f85e5e38bd0daed619636faf5da0cdfce7131bfec2a98c9d10d82da		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7FE5 15192 bytes

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