Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ab6104784a8a3c3…

MALICIOUS

PDF

45.6 KB Created: 2020-08-18 23:32:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bcbc4ff914e0ae27b4baa93622e0684e SHA-1: 0ed002acff3c5e351d7d4e403e0aa835f4c7b6e3 SHA-256: 6ab6104784a8a3c363b950255bfc6ba4479b05495d258333c1994811563ed1f0
154 Risk Score

Malware Insights

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

The PDF contains a link to a redirector, ttraff.cc, which is flagged as malicious. The document body, though heavily obfuscated, contains text related to 'Skype old version for windows', suggesting a lure. The presence of a large number of external PDF links, many pointing to potentially untrusted domains, further supports a malicious intent, likely to distribute further malware or engage in SEO-based link farming for malicious purposes.

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=skype+old+version+for+windows
    • http://fofawo.brosmakingadifference.org/uploads/1/3/1/6/131606289/5560083.pdf
    • http://files.dogfishneworleans.com/uploads/1/3/0/7/130739328/vodomusifenupeko.pdf
    • http://files.ardemolition.com/uploads/1/3/0/7/130738779/gegevejarutoriv-darotepuvopen-ruvapil.pdf
    • http://jitori.jeffersonequestrian.org/uploads/1/3/1/0/131070161/aff8bb.pdf
    • http://files.benztransport.com/uploads/1/3/1/3/131379183/zufewawo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0437/1385/5643/files/budapest_travel_guide_free.pdf
    • https://cdn.shopify.com/s/files/1/0428/5048/4390/files/97176127641.pdf
    • https://cdn.shopify.com/s/files/1/0437/3191/0810/files/magoliwixiwube.pdf
    • https://cdn.shopify.com/s/files/1/0431/5503/0170/files/centella_asiatica_wound_healing.pdf
    • https://cdn.shopify.com/s/files/1/0432/2656/2722/files/39984638728.pdf
    • https://cdn.shopify.com/s/files/1/0438/4089/7174/files/3834224683.pdf
    • https://cdn.shopify.com/s/files/1/0448/4258/2176/files/partitura_para_piano_hallelujah_shrek.pdf
    • https://cdn.shopify.com/s/files/1/0441/2289/8584/files/635874384.pdf
    • https://cdn.shopify.com/s/files/1/0434/6609/6802/files/magic_arena_download.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000673b.bin
8e87f19e60f58001acd150e33b27030f22bac0e5a5bb17b02ae3786c86567da9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x673B 4952 bytes
font_01_sfnt_off00007831.bin
3daac61b222ca8c87f881a12865754ff6ceff0abd8ebe9eb36b97445d42885b0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7831 10232 bytes
font_02_sfnt_off00009afe.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9AFE 4324 bytes

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