Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbf8bbe6b2db3ccf…

MALICIOUS

PDF

48.9 KB Created: 2020-08-22 02:25:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 36f18e6ceefb976ba735b038d970fa97 SHA-1: d6fbb5c226d394eed8e4f7c3abcf335dfd018f69 SHA-256: cbf8bbe6b2db3ccfa8b68ae26856e890b349790035a98b0af3f25021dd84173b
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged as malicious by a machine learning classifier and contains a significant number of embedded links. One critical heuristic identified a link to known malicious redirector infrastructure (https://ttraff.cc/pify?keyword=accel+world+ending+1), and another identified a large external PDF link farm. These findings suggest the document's primary purpose is to lure users into clicking malicious links, likely for phishing or malware delivery.

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=accel+world+ending+1
    • http://files.heartwellsdesigns.com/uploads/1/3/1/0/131070112/podobati-butamew-nagafofezor.pdf
    • http://deduvedig.spottyrain.com/uploads/1/3/1/3/131379578/jaxepinituz.pdf
    • http://files.powerandhealing.com/uploads/1/3/1/4/131407952/nozeri-buzobodosugax-wigufamupevafik.pdf
    • http://files.catchamomentphotos.com/uploads/1/3/1/4/131453333/zapudiwazofefewogiv.pdf
    • https://cdn.shopify.com/s/files/1/0437/6487/5418/files/ielts_404_reading_test_1_answers.pdf
    • https://cdn.shopify.com/s/files/1/0448/9995/8939/files/tobenokulugaziporavurixi.pdf
    • https://cdn.shopify.com/s/files/1/0431/4133/3147/files/puvumofer.pdf
    • https://cdn.shopify.com/s/files/1/0433/6176/3480/files/14320871577.pdf
    • https://cdn.shopify.com/s/files/1/0433/1683/8558/files/dewikisegerogubebajekapa.pdf
    • https://cdn.shopify.com/s/files/1/0438/3368/8226/files/advanced_cardiac_life_support_guidelines_2020.pdf
    • https://cdn.shopify.com/s/files/1/0431/8652/0224/files/75510937967.pdf
    • https://cdn.shopify.com/s/files/1/0431/2875/0234/files/latebanavofizik.pdf
    • https://cdn.shopify.com/s/files/1/0432/9301/6232/files/annamayya_telugu_songs_free.pdf
    • https://cdn.shopify.com/s/files/1/0435/0319/0181/files/duniwivi.pdf
    • https://cdn.shopify.com/s/files/1/0432/8642/9861/files/81499451875.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_off00006268.bin
1e7e35a5c9823349dac78ea271e5dffbdcbccdbf8c3b15a41793889e42545de6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6268 10064 bytes
font_01_sfnt_off000083d9.bin
393bd9df866d8785dc098690bfaeb8a75d3bfb76891711e50b6ef5718fb4b11c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x83D9 4852 bytes
font_02_sfnt_off00009472.bin
24b16bb414ee228ea5d6838cccc396e201e79042829111f36f6411218f843d71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9472 9968 bytes

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