Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a207fd61ec28fa8…

MALICIOUS

PDF

45.9 KB Created: 2020-07-16 22:03:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e0648c675d17a1171ea0e528aadd7d35 SHA-1: 0b433d9672ffb7348d74f63bf80d4b62babdd06b SHA-256: 9a207fd61ec28fa8dff98605dd6341d659bde781d452cec3901c66878f180be0
154 Risk Score

Malware Insights

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

The PDF contains numerous links designed to appear as legitimate downloads, but they redirect to malicious infrastructure. The primary lure is a fake link for 'options futures and other derivatives 10th edition pdf free download'. The ML classifier strongly indicated maliciousness, and the PDF structure itself is suspicious due to a high volume of external links.

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=options%20futures%20and%20other%20derivatives%2010th%20edition%20pdf%20free%20download
    • http://files.thestationinclaresholm.ca/uploads/1/3/2/6/132682930/4e2b7c8c0.pdf
    • http://files.odinshorsewoodworks.com/uploads/1/3/1/4/131407406/dolibiguwe.pdf
    • http://files.tijaniya.org/uploads/1/3/1/3/131398022/f2d635f.pdf
    • http://files.makingsiliconebabies.com/uploads/1/3/1/1/131163859/bolumumojilid.pdf
    • http://files.dentalexcellenceindia.com/uploads/1/3/0/7/130776374/2798006.pdf
    • http://files.michaeljosephmurray.com/uploads/1/3/1/4/131407898/zemewu-tagejasabival.pdf
    • http://files.hd-crafts.com/uploads/1/3/1/1/131163914/gukusewavafa_zamopelumafimek.pdf
    • http://files.dalycitytowing.org/uploads/1/3/1/1/131164125/rukajad-bizevupigox-lapedanab-nutokuruzo.pdf
    • http://files.thepiteamofillinois.com/uploads/1/3/1/0/131071312/4059306.pdf
    • http://files.hd-crafts.com/uploads
    • https://piledina.files.wordpress.com/2020/06/liluwowoxuzopofazemokes.pdf
    • https://rerazudo.files.wordpress.com/2020/07/66467685622.pdf
    • https://venazuburam.files.wordpress.com/2020/06/nizopejemesi.pdf
    • https://ribesed.files.wordpress.com/2020/06/20225856702.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zonixalekena.pdf
    • https://cdn.shopify.com/s/files/1/0431/2226/2178/files/76625925445.pdf
    • https://cdn.shopify.com/s/files/1/0431/6191/1458/files/32559566824.pdf
    • https://cdn.shopify.com/s/files/1/0428/4622/4551/files/zokuwutor.pdf
    • https://cdn.shopify.com/s/files/1/0432/2692/3172/files/ludonuden.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/lugapib.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/zipepatijexozuzazes.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_off000072f3.bin
01be53719811f691aecd859fca0ff67d98d770174a75f7ba9e30a472d51b85d4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72F3 5384 bytes
font_01_sfnt_off0000854a.bin
5b31607ac7513e282f4f869a0350ef2286706c1e7a9ded1af075949fb433a836		 pdf-font-stream PDF embedded font (sfnt) at offset 0x854A 10708 bytes

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