Malicious PDF — malware analysis report

Static analysis result for SHA-256 a34c52b57bf43c5a…

MALICIOUS

PDF

114.0 KB Created: 2020-08-05 07:54:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2170a9047c908184b721a1582e986719 SHA-1: cea76efb7bfe359d53aad30c5d89f3310a4ec022 SHA-256: a34c52b57bf43c5ae2d72b4714c991ae684732a501003fa03e625949e5b17cd3
154 Risk Score

Malware Insights

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

The PDF contains a link farm designed to redirect users to malicious infrastructure, specifically targeting searches for 'Oxford advanced learner s dictionary of current english pdf'. The primary malicious URL identified is https://ttraff.ru/pify?keyword=oxford+advanced+learner+s+dictionary+of+current+english+pdf. This indicates a social engineering attempt to lure victims into clicking malicious links under the guise of providing a useful document. No scripts were extracted, limiting the analysis of direct payload execution.

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=oxford+advanced+learner+s+dictionary+of+current+english+pdf
    • http://files.hokuloaoutrigger.com/uploads/1/3/1/4/131437576/webonumerum_nazedi_zuzewatejagopo.pdf
    • http://files.ayudaavivir.org.mx/uploads/1/3/1/4/131437157/bejobovadabodaw.pdf
    • http://telusiw.qksnd.com/uploads/1/3/1/4/131454012/kiniviza-meziburixenil.pdf
    • http://files.sidneyshelbychamber.com/uploads/1/3/2/6/132696145/fidujo_zuvetare.pdf
    • http://files.camberwellwalkies.com/uploads/1/3/1/6/131636625/domivuna.pdf
    • https://cdn.shopify.com/s/files/1/0438/4840/1046/files/72101330614.pdf
    • https://cdn.shopify.com/s/files/1/0435/2566/9028/files/69773653232.pdf
    • https://cdn.shopify.com/s/files/1/0434/4155/3575/files/magazine_rack_gungeon.pdf
    • https://cdn.shopify.com/s/files/1/0433/3666/3208/files/jugabamepasafotezezusuvu.pdf
    • https://cdn.shopify.com/s/files/1/0430/8343/2096/files/1544273085.pdf
    • https://cdn.shopify.com/s/files/1/0429/7195/5351/files/92242667820.pdf
    • https://cdn.shopify.com/s/files/1/0436/4081/5774/files/90157877737.pdf
    • https://cdn.shopify.com/s/files/1/0436/6322/9078/files/fazid.pdf
    • https://cdn.shopify.com/s/files/1/0432/5477/5970/files/wigekilafu.pdf
    • https://cdn.shopify.com/s/files/1/0430/9732/5732/files/97782573777.pdf
    • https://cdn.shopify.com/s/files/1/0431/5483/3564/files/migikupitolulufiburiv.pdf
    • https://cdn.shopify.com/s/files/1/0431/2816/0417/files/39819363557.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa89.bin
5c22853815f02d06704988df5f2c1d741e880953df4d93fefd72ea570783f8c5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA89 39288 bytes
font_01_sfnt_off0001736f.bin
1d836283b48f75d118e297ab566dbd33d3aa26d8b033aaecdb16ad79a7a76d74		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1736F 5672 bytes
font_02_sfnt_off000186ca.bin
a50a56c7135fcc92533282d0afcb2f6a5aff3de490e3dafb851d2e5b69d95543		 pdf-font-stream PDF embedded font (sfnt) at offset 0x186CA 17420 bytes

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