Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bb53cbf82199096…

MALICIOUS

PDF

35.4 KB Created: 2020-08-06 13:28:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ade9585178d391070fcc5bf3b62444b2 SHA-1: b5aba1bf6a33654867df15016e2725b770560fb7 SHA-256: 9bb53cbf82199096657835baa471b6372b3755ac000069c08b2b0e098af3816e
150 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with a critical heuristic firing for a malicious redirector link. The document body, though partially corrupted, contains text suggesting a lure for a 'vocabulary answer key'. The primary malicious IOC is the redirector URL, which likely leads to further malicious content or exploits. No scripts were extracted, and the PDF structure itself is the primary vector for the attack.

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.cc/pify?keyword=boost+your+vocabulary+2+answer+key+pdf
    • http://xigopob.icptraining.co.za/uploads/1/3/0/9/130969368/wowevipagitepor.pdf
    • http://files.hammerheaddfs.com/uploads/1/3/0/7/130776644/41eaf28c8f845.pdf
    • http://files.koaguitarsets.com/uploads/1/3/2/6/132681460/5bfb906f52.pdf
    • http://files.designsbysarahmeyer.com/uploads/1/3/1/4/131437139/d49d002b3c4b.pdf
    • https://cdn.shopify.com/s/files/1/0432/0083/9841/files/tofilokametetaniri.pdf
    • https://cdn.shopify.com/s/files/1/0436/7102/7865/files/litres_to_gallons.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/pajotoliwafugesekediriw.pdf
    • https://cdn.shopify.com/s/files/1/0434/5413/6473/files/nios_deled_registration_form.pdf
    • https://cdn.shopify.com/s/files/1/0431/7777/1164/files/10765908738.pdf
    • https://cdn.shopify.com/s/files/1/0431/6191/1460/files/tunudiperexibupalajelule.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/kikurum.pdf
    • https://cdn.shopify.com/s/files/1/0429/8381/7375/files/xetixefixagarosed.pdf
    • https://cdn.shopify.com/s/files/1/0429/6278/0311/files/10729295724.pdf
    • https://cdn.shopify.com/s/files/1/0434/7704/1304/files/bagezijotokubew.pdf
    • https://cdn.shopify.com/s/files/1/0432/6676/9051/files/66560452176.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_off0000462e.bin
847941d1e0a765194cae806f526a9315da12c5f30c758a3f6be8754ee8ccbf0d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x462E 5788 bytes
font_01_sfnt_off00005a15.bin
607efe10aa730219eb82061740d9a6b6946961038a3da8b6f2d9418a23866238		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5A15 14684 bytes

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