Malicious PDF — malware analysis report

Static analysis result for SHA-256 c588a3a05afeca73…

MALICIOUS

PDF

44.4 KB Created: 2020-08-25 16:27:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ddafbc7b66e7da3b44d9abff518c2a26 SHA-1: 1beb7c284f7cdcc6d637ec4dd2f4407dabd1c08f SHA-256: c588a3a05afeca731a70ee7bae9fa02c0b9af2a04e415d8e5bcaa37d2d8dbe61
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link, directing users to 'ttraff.ru'. Additionally, it exhibits characteristics of a PDF link farm, embedding numerous external links, many hosted on Shopify. The document body, though heavily obfuscated, contains the same malicious URL and other Shopify URLs, suggesting a coordinated effort to distribute malicious content under the guise of educational materials. No scripts were extracted from this sample.

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=florida+algebra+1+eoc+practice+test+pdf
    • http://files.odinshorsewoodworks.com/uploads/1/3/0/7/130738921/nenarasag.pdf
    • http://files.cassandraatcherley.com/uploads/1/3/1/4/131453990/zelodutok.pdf
    • http://biwite.rgvmenu.com/uploads/1/3/1/3/131383657/2639328.pdf
    • https://cdn.shopify.com/s/files/1/0430/9352/4637/files/fujavam.pdf
    • https://cdn.shopify.com/s/files/1/0437/3292/6616/files/python_sort_vs_sorted.pdf
    • https://cdn.shopify.com/s/files/1/0432/9163/9974/files/38136173144.pdf
    • https://cdn.shopify.com/s/files/1/0431/7957/3414/files/mijuxedurede.pdf
    • https://cdn.shopify.com/s/files/1/0438/3745/6534/files/former_kwwl_reporters.pdf
    • https://cdn.shopify.com/s/files/1/0435/6079/6318/files/70083366946.pdf
    • https://cdn.shopify.com/s/files/1/0429/1395/6007/files/77204103135.pdf
    • https://cdn.shopify.com/s/files/1/0429/5553/8595/files/foreach_javascript_array_of_objects.pdf
    • https://cdn.shopify.com/s/files/1/0428/6126/5062/files/81309788765.pdf
    • https://cdn.shopify.com/s/files/1/0433/2604/6362/files/66815117641.pdf
    • https://cdn.shopify.com/s/files/1/0433/0297/7700/files/vepasokamifezaxo.pdf
    • https://cdn.shopify.com/s/files/1/0431/1092/4437/files/fuwov.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_off00006043.bin
4334f4edb04bf1cf591373bc9ff0cbd9987e76d0b6aa216d1dc3dd0a02179294		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6043 5152 bytes
font_01_sfnt_off000071dc.bin
2510ae022b1612bab0257f7398d67b9e5612078eda324aea237834aa5a9e2292		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71DC 10736 bytes
font_02_sfnt_off0000968f.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x968F 4324 bytes

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