Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3517e79f7582b11…

MALICIOUS

PDF

46.0 KB Created: 2020-08-15 08:14:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ef165e533bdf933299a20f3934d19b59 SHA-1: d6d40362b7f08aabe331904a5fd62a3af2ca103b SHA-256: b3517e79f7582b1148b20017bebf601dd47b0cbc6290fb839c872f4b62b332c7
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDF files hosted on various domains, suggesting a link farm for SEO manipulation or to obscure malicious redirects. One critical heuristic identified a link to a known malicious redirector, ttraff.cc. The document body, though heavily obfuscated, contains the same redirector URL and references a thesis PDF, indicating a lure. No scripts were extracted from this sample.

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=online+catering+reservation+system+thesis+pdf
    • http://files.guyettefarms.com/uploads/1/3/1/6/131607712/zafibuv.pdf
    • http://files.southorndollstylequeen.com/uploads/1/3/0/8/130873861/mesividetos_vutotif.pdf
    • http://files.alergomed.org/uploads/1/3/1/1/131164431/tafitatewarit.pdf
    • http://files.medicineboxproject.org/uploads/1/3/1/4/131437312/gixinadikuno-gebojalofiza-dufezegupexo.pdf
    • http://sidudedo.thepotatostorage.com/uploads/1/3/1/0/131070420/tomipe.pdf
    • https://cdn.shopify.com/s/files/1/0432/3062/5950/files/ammonium_sulphate_precipitation_table.pdf
    • https://cdn.shopify.com/s/files/1/0435/0305/9110/files/vugezelinemaju.pdf
    • https://cdn.shopify.com/s/files/1/0437/2699/5621/files/zubeguravozoninowavi.pdf
    • https://cdn.shopify.com/s/files/1/0431/9608/8481/files/aleister_crowley_magick_ita.pdf
    • https://cdn.shopify.com/s/files/1/0436/8557/6857/files/fool_in_the_rain_lyrics.pdf
    • https://cdn.shopify.com/s/files/1/0432/5693/8658/files/17866150684.pdf
    • https://cdn.shopify.com/s/files/1/0434/5207/2086/files/fallout_new_vegas_ultimate_mod.pdf
    • https://cdn.shopify.com/s/files/1/0437/1054/6071/files/69930162123.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/72593533024.pdf
    • https://cdn.shopify.com/s/files/1/0429/5445/7254/files/sekaluferidanipur.pdf
    • https://cdn.shopify.com/s/files/1/0434/4388/0093/files/jexejisekoranoje.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_off00007189.bin
54502e9b1c32c6a15935094bf93e537d46b0666fb716340f1ec7ee72bf5f1359		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7189 5756 bytes
font_01_sfnt_off00008502.bin
c75768d763bd1db3ea866b890c71368bce3a9f9fec2c9ab424c75c80c733ac86		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8502 10952 bytes

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