Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d5a373c47e5b3cd…

MALICIOUS

PDF

50.4 KB Created: 2020-08-30 12:21:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fafd20406e17754bb3aa3f7d9f32b7c3 SHA-1: 243567321ed9a1864c136bbff72b2a95771c40ba SHA-256: 3d5a373c47e5b3cdf1e3e3866d8b3b747c8670e747b63c8bf73e399b7f09caf9
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a prominent link that redirects to a known malicious domain, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains the text "Learning hacking pdf" and the malicious URL, suggesting a social engineering lure. The PDF also exhibits characteristics of a link farm, with numerous embedded links pointing to external resources, further supporting the malicious intent.

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/wix?keyword=learning+hacking+pdf
    • https://cdn.shopify.com/s/files/1/0432/7600/9622/files/beyond_the_valley_of_thorns.pdf
    • https://cdn.shopify.com/s/files/1/0432/0854/0324/files/25520171638.pdf
    • https://cdn.shopify.com/s/files/1/0428/8770/8825/files/rigixipofokikunarasos.pdf
    • https://cdn.shopify.com/s/files/1/0440/2728/1558/files/ncert_biology_class_11_morphology_of_flowering_plants.pdf
    • https://cdn.shopify.com/s/files/1/0435/4496/9367/files/vozolome.pdf
    • https://cdn.shopify.com/s/files/1/0429/9699/0105/files/false_ceiling_designs_for_hall.pdf
    • https://cdn.shopify.com/s/files/1/0429/2093/5590/files/miritejunepudikafi.pdf
    • https://cdn.shopify.com/s/files/1/0437/1379/0106/files/the_complete_contest_prep_guide.pdf
    • https://cdn.shopify.com/s/files/1/0431/5122/9089/files/puladevugikilikudimigixek.pdf
    • https://cdn.shopify.com/s/files/1/0434/0809/7445/files/79494428521.pdf
    • https://cdn.shopify.com/s/files/1/0428/5107/4214/files/sunday_adelaja_books.pdf
    • https://cdn.shopify.com/s/files/1/0437/9652/9313/files/cell_biology_definition.pdf
    • https://cdn.shopify.com/s/files/1/0459/8733/2253/files/equifax_dispute_resolution_form.pdf
    • https://cdn.shopify.com/s/files/1/0429/1588/9305/files/xinimak.pdf
    • https://cdn.shopify.com/s/files/1/0433/2358/8773/files/tilijegemumitavukoxur.pdf
    • https://cdn.shopify.com/s/files/1/0450/3647/0430/files/ravish_kumar_book_the_free_voice_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/4543/7083/files/l_glucose_chair_conformation.pdf
    • https://cdn.shopify.com/s/files/1/0437/7998/1470/files/11317440084.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_off00007bc8.bin
80f06fdb57944717758551ce1cbb29d92ed2b4e056ee5796591d2726465be11a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7BC8 4808 bytes
font_01_sfnt_off00008c0d.bin
6421696a3fc2b4470cd362564cd0183e0745e6ab90155d448de35791a47c136d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8C0D 9948 bytes
font_02_sfnt_off0000ae23.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAE23 4324 bytes

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