Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ff5795b989e01fe…

MALICIOUS

PDF

54.0 KB Created: 2020-08-08 23:37:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 571087ad1de5694f22dc4f144feb53cc SHA-1: 3b4b6b877c795f065dd181a892aafa009030529b SHA-256: 0ff5795b989e01fe5589781ea47984e615fcd913c7bc327edd06c9f5a4efd708
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, many of which point to external resources, including a known malicious redirector. The document body, though heavily obfuscated, contains text suggesting a lure related to 'building your ir theory toolbox pdf'. The ML classifier strongly indicated maliciousness, and the presence of numerous links to potentially malicious infrastructure supports a phishing or redirection attack pattern.

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/wb?keyword=building%20your%20ir%20theory%20toolbox%20pdf
    • http://files.maxxyieldag.com/uploads/1/3/1/4/131437669/2805606.pdf
    • http://files.fioga.org/uploads/1/3/1/6/131606617/tegedubu_nasasanepomub.pdf
    • http://files.stoneycreekvillas.net/uploads/1/3/0/8/130874582/3266412ba.pdf
    • http://files.rcmhistory9.com/uploads/1/3/1/8/131857199/mexilebas.pdf
    • http://files.etcherrycreekfarms.com/uploads/1/3/0/8/130873804/kosizisini-wujimazebem.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/5955/2166/files/mimatorodu.pdf
    • https://cdn.shopify.com/s/files/1/0428/1086/7871/files/metodo_del_carbono_14.pdf
    • https://cdn.shopify.com/s/files/1/0432/9334/3902/files/fundamentals_of_physics_halliday_9th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0433/1231/6584/files/cat_faces_emoticons.pdf
    • https://cdn.shopify.com/s/files/1/0429/8126/1466/files/datufuketulivuxotekot.pdf
    • https://cdn.shopify.com/s/files/1/0438/4971/1781/files/91043224276.pdf
    • https://cdn.shopify.com/s/files/1/0428/7689/5398/files/46219015234.pdf
    • https://cdn.shopify.com/s/files/1/0432/7853/2761/files/im_a_believer_chords.pdf
    • https://cdn.shopify.com/s/files/1/0429/2355/7030/files/dufolalilumu.pdf
    • https://cdn.shopify.com/s/files/1/0437/2224/4250/files/restaurant_operations_manual.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_off00007c5a.bin
bceca2465f4bf27ab2eb0cdeaaf680f3a02c776fd2c6a3d02b4d038341d7b939		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C5A 5276 bytes
font_01_sfnt_off00008e51.bin
1907542069efabe34c88c298fce160f2e2b815df3cb79ef30357f164f8ecb7c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8E51 10736 bytes
font_02_sfnt_off0000b320.bin
cc4dcf9b3f20d6ee28823ee0c936756282ca457d240c648fb056104074dd32c9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB320 16836 bytes

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