Malicious PDF — malware analysis report

Static analysis result for SHA-256 528ac654bebdfdc0…

MALICIOUS

PDF

45.6 KB Created: 2020-08-19 14:43:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a8979da4b4e14b4b6a317bcae1078153 SHA-1: d1ed9a75fe310272c8da9fdf3a407573bb96ead0 SHA-256: 528ac654bebdfdc0576c989d97ab828ce5ffa30a542f44cd2e56f1e393680950
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded links, with one critical heuristic identifying a malicious redirector. The document body, though corrupted, appears to be a lure for a 'Hadoop command cheat sheet'. The primary malicious URL, https://ttraff.ru/pify?keyword=hadoop+command+cheat+sheet, is a redirector designed to lead users to further malicious content. The ML classifier also strongly indicated maliciousness.

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.ru/pify?keyword=hadoop+command+cheat+sheet
    • http://files.kimsplaceco.com/uploads/1/3/2/7/132740327/f29fbf72079c6.pdf
    • http://files.thingsfromthebasement.com/uploads/1/3/0/7/130776646/4569584.pdf
    • http://files.shepherdshousenazarene.net/uploads/1/3/1/3/131398117/7553195.pdf
    • http://files.fcdetail.com/uploads/1/3/0/7/130739175/kaloxetusotat-jemezizi.pdf
    • https://cdn.shopify.com/s/files/1/0438/6439/1845/files/digajo.pdf
    • https://cdn.shopify.com/s/files/1/0431/1020/3556/files/xosojewuwuwagojis.pdf
    • https://cdn.shopify.com/s/files/1/0435/6089/4627/files/89016702382.pdf
    • https://cdn.shopify.com/s/files/1/0432/5205/6227/files/79711599186.pdf
    • https://cdn.shopify.com/s/files/1/0434/1284/8790/files/30785363225.pdf
    • https://cdn.shopify.com/s/files/1/0430/6731/0231/files/71999908362.pdf
    • https://cdn.shopify.com/s/files/1/0434/6393/4109/files/puzenipufiposegafupimori.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/sividejujim.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_off0000675b.bin
f6affaec6b7277065f46add2847910785ad56015f0eefe14680641b0f36ee81b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x675B 5144 bytes
font_01_sfnt_off000078ac.bin
ba3e753c093884b37dc4741a79c69dceee043c5b01efe994d2f0b0fa929af952		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78AC 15856 bytes

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