Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bb98697e007bb6d…

MALICIOUS

PDF

51.8 KB Created: 2020-08-10 11:15:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eadb051ce1816c83631f1d142d8dbe92 SHA-1: d981dec3b25f590cde159066fd328a40b67d93f6 SHA-256: 0bb98697e007bb6d01efb9e9a7826d267a775c971cfd1f1319aa018505b83502
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link farm designed to appear as a free download for an anatomy coloring book, but the primary link redirects to malicious infrastructure. The ML classifier strongly indicated maliciousness, and the PDF structure suggests it's part of a SEO spam campaign to drive traffic to potentially harmful sites. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

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/pify?keyword=kaplan+anatomy+coloring+book+pdf+free+download
    • http://mavopagu.tuskiescurbside.com/uploads/1/3/0/8/130813528/jowaxixejek.pdf
    • http://files.richelleputnam.net/uploads/1/3/0/7/130739084/zofowime.pdf
    • http://bufoki.ukumar.in/uploads/1/3/1/3/131380600/pajukavitazosavi.pdf
    • http://files.purdiewood.com/uploads/1/3/0/7/130740375/gokela.pdf
    • http://wukuluk.delcocheetahcat.com/uploads/1/3/0/7/130775971/b41d156c1c7f6a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0438/3073/9106/files/82627051823.pdf
    • https://cdn.shopify.com/s/files/1/0438/4086/4421/files/19144695355.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/81579197248.pdf
    • https://cdn.shopify.com/s/files/1/0440/6666/8694/files/nukobiwevawifaxafisago.pdf
    • https://cdn.shopify.com/s/files/1/0431/8153/9489/files/80529202741.pdf
    • https://cdn.shopify.com/s/files/1/0432/6414/7609/files/98713448816.pdf
    • https://cdn.shopify.com/s/files/1/0431/3179/7668/files/6072095585.pdf
    • https://cdn.shopify.com/s/files/1/0432/0857/3085/files/8554073545.pdf
    • https://cdn.shopify.com/s/files/1/0431/8917/4432/files/55338351389.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/liwukepurenugiweda.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000723a.bin
895b2e7003748ffeb020b1d797c649720967e6d483c5853c89f006be1d8195ed		 pdf-font-stream PDF embedded font (sfnt) at offset 0x723A 5452 bytes
font_01_sfnt_off000084c0.bin
f56edc3daabe260161718e39021f4805900e033237b0f3814be3c3de79ec29cd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x84C0 15256 bytes
font_02_sfnt_off0000b3f3.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB3F3 4324 bytes

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