Malicious PDF — malware analysis report

Static analysis result for SHA-256 035a66ec210ae87e…

MALICIOUS

PDF

40.8 KB Created: 2020-08-10 03:01:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b733b441d0f18731539f182b337be3d7 SHA-1: 5bc2b3d0a2a5ae41f38ab3e4d40b3e700678dd1c SHA-256: 035a66ec210ae87ef0a80785b94ba13858feeedab49a31ae40c27ba4ea66f771
162 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 suspicious or unknown domains, indicating a link farm. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://ttraff.ru/pify?keyword=children+s+tylenol+dosing+pdf'. The document body also contains the same URL, suggesting an attempt to lure users to this malicious site. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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=children+s+tylenol+dosing+pdf
    • http://dotemax.helenissocial.ca/uploads/1/3/1/8/131856772/313a5.pdf
    • http://files.effectivemortgage.com/uploads/1/3/1/4/131407089/mafemidoxa.pdf
    • http://files.spearmintcleaning.com/uploads/1/3/2/6/132681293/manawisereke.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/4800/8866/files/analysis_principles_in_software_engineering.pdf
    • https://cdn.shopify.com/s/files/1/0428/5346/6271/files/97801307476.pdf
    • https://cdn.shopify.com/s/files/1/0437/1713/2456/files/bleep_test_adalah.pdf
    • https://cdn.shopify.com/s/files/1/0430/3834/3322/files/zaranimefinunikajutozu.pdf
    • https://cdn.shopify.com/s/files/1/0432/5277/7118/files/biochemistry_book_for_medical_students.pdf
    • https://cdn.shopify.com/s/files/1/0429/1028/5990/files/warunojokaxudafu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/xakisone.pdf
    • https://cdn.shopify.com/s/files/1/0432/6031/3768/files/advanced_strength_of_materials_nptel.pdf
    • https://cdn.shopify.com/s/files/1/0427/4146/5244/files/59730504127.pdf
    • https://cdn.shopify.com/s/files/1/0436/1791/0946/files/fifty_shades_of_gray.pdf
    • https://cdn.shopify.com/s/files/1/0430/0649/2823/files/macbeth_sparknotes.pdf
    • https://cdn.shopify.com/s/files/1/0431/9395/8560/files/35261319889.pdf
    • https://cdn.shopify.com/s/files/1/0430/0367/4785/files/zutin.pdf
    • https://cdn.shopify.com/s/files/1/0436/3167/3502/files/94952798090.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006315.bin
0c938471a8381dcd6b0fe4fef5d0ca519729b182514d8211f00633e4ddc3e23b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6315 5100 bytes
font_01_sfnt_off00007470.bin
e2df6563d4de03db28523d368c7d48884e79b41d4f138ddcc731726510b6058f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7470 9884 bytes

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