Malicious PDF — malware analysis report

Static analysis result for SHA-256 051d360c7d2c3600…

MALICIOUS

PDF

42.6 KB Created: 2020-08-09 03:08:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 989b043231a7e60db3b37324e1fe87bd SHA-1: 8c31bc35591c29aae7e2956dce546094a5aedf7d SHA-256: 051d360c7d2c3600a6fa1ddb88630042e304e6a7c7887df0455b6c339e210feb
154 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to a redirector service (ttraff.ru) known for malicious activity. The document body, though obfuscated, contains the URL https://ttraff.ru/pify?keyword=area+and+perimeter+of+circle+pdf, suggesting a lure to download further content. The ML classifier also strongly indicated maliciousness.

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.ru/pify?keyword=area+and+perimeter+of+circle+pdf
    • http://files.dianakemp.com.au/uploads/1/3/1/3/131398380/tilew.pdf
    • http://files.sisterspiritwomensharingspirituality.org/uploads/1/3/2/8/132815154/58853863.pdf
    • http://files.goyneselementary.com/uploads/1/3/1/0/131070842/vovonuwejajifi.pdf
    • http://files.findyourporch.com/uploads/1/3/0/7/130776267/tifen.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0439/2330/8712/files/naberepidozaloduradeguk.pdf
    • https://cdn.shopify.com/s/files/1/0434/2756/1628/files/xulinupiwunudonifasorivi.pdf
    • https://cdn.shopify.com/s/files/1/0439/5106/3195/files/16991446018.pdf
    • https://cdn.shopify.com/s/files/1/0435/4313/4362/files/kugizimesalum.pdf
    • https://cdn.shopify.com/s/files/1/0430/9146/0247/files/vunipibuji.pdf
    • https://cdn.shopify.com/s/files/1/0431/6856/3355/files/41271885914.pdf
    • https://cdn.shopify.com/s/files/1/0432/7243/7910/files/65229869027.pdf
    • https://cdn.shopify.com/s/files/1/0434/5892/0605/files/veneridened.pdf
    • https://cdn.shopify.com/s/files/1/0433/9413/8277/files/97283741956.pdf
    • https://cdn.shopify.com/s/files/1/0431/8828/9694/files/nekoruzuvisidito.pdf
    • https://cdn.shopify.com/s/files/1/0429/0645/2127/files/89967711327.pdf
    • https://cdn.shopify.com/s/files/1/0434/4987/6630/files/good_manufacturing_practice_gmp_guidelines.pdf
    • https://cdn.shopify.com/s/files/1/0428/7699/3695/files/jamipeketugurudamewumop.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006419.bin
2f8fd471423ff50beb9534e44175401a257fe64647d1a69294ee726bff4c3aa6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6419 5112 bytes
font_01_sfnt_off0000756c.bin
ca8821f48465591b0e84e32023fd53cf4a77a6ea44c937c41da647914cb4105a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x756C 11864 bytes

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