Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe66951b482e1faf…

MALICIOUS

PDF

39.6 KB Created: 2020-08-20 03:58:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0f9042f91c2d221f5185af34a76901eb SHA-1: e824ed0ed207999de86c1dbb09d282dcfb38aae6 SHA-256: fe66951b482e1faf75591ee5fe2017480b75b1e42730cdb92cb60e8bb025ac2c
152 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, pointing to 'ttraff.cc'. The document body also contains this URL, presented as a lure for free wedding templates. The ML classifier strongly flagged this PDF as malicious. The presence of multiple embedded links, many pointing to Shopify, suggests a link farm or SEO poisoning attempt to drive traffic to malicious sites.

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.cc/pify?keyword=free+wedding+border+templates+for+microsoft+word
    • http://maxeka.bcartglass.com/uploads/1/3/0/9/130969690/9f757be8a8.pdf
    • https://cdn.shopify.com/s/files/1/0435/9438/3522/files/que_es_una_cadena_alimentaria.pdf
    • https://cdn.shopify.com/s/files/1/0431/4926/3004/files/56148967407.pdf
    • https://cdn.shopify.com/s/files/1/0431/8517/6736/files/87440363232.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/44240048578.pdf
    • https://cdn.shopify.com/s/files/1/0433/5783/1326/files/a_level_further_mathematics.pdf
    • https://cdn.shopify.com/s/files/1/0431/1459/4466/files/vomubodonadixuwoda.pdf
    • https://cdn.shopify.com/s/files/1/0433/7352/7203/files/tumereseluk.pdf
    • https://cdn.shopify.com/s/files/1/0428/1381/6995/files/lulusafupapakogawerewuwol.pdf
    • https://cdn.shopify.com/s/files/1/0445/5759/8884/files/srimad_bhagavatam_sanskrit.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_off00005d5e.bin
19a1aba5fda4a31378c4c64b8257c33aed9c034703af69c486dba04eb592b154		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D5E 5664 bytes
font_01_sfnt_off0000708e.bin
180ac48153d8ed8fe7e1b98da1cbef381a9b680059e1af5220631ced0f52ed50		 pdf-font-stream PDF embedded font (sfnt) at offset 0x708E 9604 bytes

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