Malicious PDF — malware analysis report

Static analysis result for SHA-256 646dd0cf8172ca9c…

MALICIOUS

PDF

52.7 KB Created: 2020-08-24 13:51:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a911f1164f791ef1d72bbffc733407f9 SHA-1: 65ef980da6d54bee7029a4b7c77208b9fc38ccf1 SHA-256: 646dd0cf8172ca9ced585fb14e301734723d490391036720054d360ddaad77a2
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to external resources, suggesting a link farm or redirection attempt. One critical heuristic identified a link to known malicious redirector infrastructure, specifically 'https://ttraff.cc/pify?keyword=standard+bend+radius+for+aluminum+sheet+metal'. The ML classifier also strongly indicated maliciousness. The document body, though partially corrupted, contains URLs that are part of this link farm.

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=standard+bend+radius+for+aluminum+sheet+metal
    • http://files.spaceliftinteriordesign.com/uploads/1/3/1/3/131379971/8fc1e5788.pdf
    • http://files.nbfapministries.org/uploads/1/3/1/3/131397927/lazanixobaki-dajude-kazerosi-simivujuwe.pdf
    • http://dosozogaz.goldaes.com/uploads/1/3/1/3/131378950/606088.pdf
    • http://files.pavlicek-foto.com/uploads/1/3/0/8/130813888/nizepabaputigebesid.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/2398/3015/files/sanitary_engineering.pdf
    • https://cdn.shopify.com/s/files/1/0431/6862/8890/files/worksheet_maker_software.pdf
    • https://cdn.shopify.com/s/files/1/0432/5651/2676/files/7262719431.pdf
    • https://cdn.shopify.com/s/files/1/0437/4049/6033/files/appointment_request_letter_sample.pdf
    • https://cdn.shopify.com/s/files/1/0445/2545/3471/files/led_zeppelin_houses_of_the_holy_songbook.pdf
    • https://cdn.shopify.com/s/files/1/0444/3108/1639/files/java_script_go_back.pdf
    • https://cdn.shopify.com/s/files/1/0429/6481/1927/files/kopidakipige.pdf
    • https://cdn.shopify.com/s/files/1/0429/4243/1395/files/free_online_ocr_service_convert_scanned_to_word.pdf
    • https://cdn.shopify.com/s/files/1/0431/4575/6833/files/ashirvada_mantram_in_telugu.pdf
    • https://cdn.shopify.com/s/files/1/0432/6057/5894/files/valkyrie_profile_2_guide.pdf
    • https://cdn.shopify.com/s/files/1/0431/5702/9019/files/adobe_pro_apk.pdf
    • https://cdn.shopify.com/s/files/1/0428/3544/3871/files/autocad_2013_portable_gratis.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007b6d.bin
2e8fefbb7bc1a2e235bbe97f903653e15ebec84844747f433e80b7ba0e29ecb9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B6D 5388 bytes
font_01_sfnt_off00008d8e.bin
4f2f40473770820e90604c84c0977853378c39c41641ee2412eb4ef8a05a3b98		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8D8E 10260 bytes
font_02_sfnt_off0000b0d1.bin
354dce64f07f3d7acdf6a04edf763950ffbfec4edcbb4bfe17b65a83544077bb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB0D1 16036 bytes

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