Malicious PDF — malware analysis report

Static analysis result for SHA-256 e36f0e609ae50e70…

MALICIOUS

PDF

43.9 KB Created: 2020-08-09 04:45:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c5ee6af68fb20f2156ee227a84b4b3d0 SHA-1: e270cb3ac33752490bccfd35de191b749acd8ab4 SHA-256: e36f0e609ae50e701ae4bbe37fafcde81141b8b7c5f1ba6ba8c4bb90604c2749
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a critical heuristic firing indicating a link to a known malicious redirector at 'https://ttraff.ru/pify?keyword=biochemistry+pdf+stoker'. This suggests the document's primary purpose is to redirect users to malicious infrastructure. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the document body and heuristics point towards a phishing or malware distribution lure.

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=biochemistry+pdf+stoker
    • http://files.dancefirstllc.com/uploads/1/3/1/1/131164479/433014.pdf
    • http://files.bringsnacks.net/uploads/1/3/2/7/132710784/aaa03.pdf
    • http://files.jennyfinkelyoga.com/uploads/1/3/1/6/131637419/f4e70d075a8e.pdf
    • http://files.cecilialanders.ca/uploads/1/3/1/6/131637374/6906713.pdf
    • https://cdn.shopify.com/s/files/1/0437/9371/1265/files/49455530197.pdf
    • https://cdn.shopify.com/s/files/1/0437/0300/9430/files/schengen_visa_application_form_austria.pdf
    • https://cdn.shopify.com/s/files/1/0432/1699/4466/files/62080265209.pdf
    • https://cdn.shopify.com/s/files/1/0431/9910/3136/files/vamukavif.pdf
    • https://cdn.shopify.com/s/files/1/0430/6924/3553/files/60690888687.pdf
    • https://cdn.shopify.com/s/files/1/0429/5095/1066/files/nasonekasomudugafu.pdf
    • https://cdn.shopify.com/s/files/1/0433/4914/7816/files/fabokozatobitekazi.pdf
    • https://cdn.shopify.com/s/files/1/0439/6787/3182/files/python_sort_a_list.pdf
    • https://cdn.shopify.com/s/files/1/0431/6495/8879/files/42997138727.pdf
    • https://cdn.shopify.com/s/files/1/0432/7079/9510/files/tabopadad.pdf
    • https://cdn.shopify.com/s/files/1/0431/8127/7342/files/support._logitech_en_us_software_lgs.pdf
    • https://cdn.shopify.com/s/files/1/0437/3282/8314/files/repair_manuals_torrent.pdf
    • https://cdn.shopify.com/s/files/1/0438/1966/3522/files/mere_pass_tum_ho_novel_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/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000644e.bin
82918597f6dc5e89200441e08dd5936db6151555a36e0520740e6ed555306289		 pdf-font-stream PDF embedded font (sfnt) at offset 0x644E 5368 bytes
font_01_sfnt_off00007672.bin
a36eee06fef6ce219692c4ec918276ac99413e4fd1e3666e4031624f9289d620		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7672 1800 bytes
font_02_sfnt_off00007eff.bin
b7912edf6322d9259af44b45debbf4f0ca657e9a5ddb9bf5a20b12602dff9752		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7EFF 10288 bytes

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