Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c535a125b25b114…

MALICIOUS

PDF

54.1 KB Created: 2020-08-01 12:45:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3011b0f03a66f3f57df51e449cc6134f SHA-1: 48c8ee0a672d0cd99225184f29ebeaf6f47dfb9e SHA-256: 6c535a125b25b114fe6b786a77ebc5f01e25d3a0c3909b94261ffd3d9ad16892
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, with one critical heuristic identifying it as a malicious redirector pointing to 'https://ttraff.ru/pify?keyword=training+guide+maplestory'. Another heuristic flagged it as a PDF link farm, indicating a large number of outbound links. The document body, though partially corrupted, contains text related to 'Training guide maplestory' and the authoring application 'wkhtmltopdf', suggesting a lure to disguise the malicious links. The ML classifier also strongly indicated maliciousness.

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.ru/pify?keyword=training+guide+maplestory
    • http://files.thepreciouspets.com/uploads/1/3/1/0/131071249/5316021.pdf
    • http://files.mindfulserenityonline.com/uploads/1/3/0/8/130874629/pezozulaleku.pdf
    • http://files.stewartvillefire.com/uploads/1/3/1/4/131407698/ee4cee66ac09.pdf
    • http://files.yosemitewawonacharter.org/uploads/1/3/2/6/132695714/fakatavum.pdf
    • http://files.silversageffa.com/uploads/1/3/1/8/131872015/birimamimegizam.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/1615/9395/files/96214769362.pdf
    • https://cdn.shopify.com/s/files/1/0432/7328/9888/files/wenerosijasuvawevunatuj.pdf
    • https://cdn.shopify.com/s/files/1/0433/8004/8023/files/59478232668.pdf
    • https://cdn.shopify.com/s/files/1/0434/3490/1671/files/java_date_to_string.pdf
    • https://cdn.shopify.com/s/files/1/0429/9119/0167/files/badakusurexikavu.pdf
    • https://cdn.shopify.com/s/files/1/0432/8734/7364/files/banino.pdf
    • https://cdn.shopify.com/s/files/1/0432/8760/9497/files/mimizudakozemudofuvowug.pdf
    • https://cdn.shopify.com/s/files/1/0437/8856/6677/files/3322164116.pdf
    • https://cdn.shopify.com/s/files/1/0434/0629/5201/files/43004566729.pdf
    • https://cdn.shopify.com/s/files/1/0432/2692/3172/files/lezuvipomavekodotasi.pdf
    • https://cdn.shopify.com/s/files/1/0432/4930/3720/files/lobodogupokaruzex.pdf
    • https://cdn.shopify.com/s/files/1/0438/3745/6534/files/betilifuvokebosugerudog.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_off0000742e.bin
9f3b85a950d632a54b481b894efe078530d3334d66b69eb22dd5019e7cbad62d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x742E 5328 bytes
font_01_sfnt_off0000863f.bin
ae2bd7a7d2abb0315e17799770168cdbe2046b8bc406ccfc808aaf99ef68d3d0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x863F 14968 bytes
font_02_sfnt_off0000b453.bin
e9fe716c2abc985b12a899a49d5539e4e8be1b56d50c083b30290d85a2a7c848		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB453 16092 bytes

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