Malicious PDF — malware analysis report

Static analysis result for SHA-256 0af78db613fef8ec…

MALICIOUS

PDF

110.9 KB Created: 2020-08-07 17:31:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: faf6b034882862a47eb12dfc88b2988b SHA-1: f8adb6d3743bed367dfe1f9ded30c7b3ee7d9cd5 SHA-256: 0af78db613fef8ec8f504856aad4dc1a8ddc2b42b55c25a88a9909b8edfe17cb
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many pointing to Shopify domains, but one critical link directs to a known malicious redirector. The document body, though heavily obfuscated, contains the same malicious URL, suggesting an attempt to disguise malicious activity as a benign document. The presence of a malicious redirector and a link farm indicates a likely attempt to drive traffic to malicious sites, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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.com/wb?keyword=sankata%20nasana%20ganapati%20stotram%20in%20tamil%20pdf
    • http://files.saundrajain.com/uploads/1/3/1/8/131857390/wuvopimuseb.pdf
    • http://files.yajindustries.com/uploads/1/3/2/7/132740564/67a532859.pdf
    • http://files.livingbarsaddles.com/uploads/1/3/1/4/131437733/8902d9.pdf
    • http://fedorahosted.org/lohit
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/3407/5558/files/3_2020.pdf
    • https://cdn.shopify.com/s/files/1/0427/4782/2236/files/sign_with_certificate_adobe_reader_dc.pdf
    • https://cdn.shopify.com/s/files/1/0433/0664/7717/files/hadoop_installation_on_mac.pdf
    • https://cdn.shopify.com/s/files/1/0428/2515/4716/files/nubovaton.pdf
    • https://cdn.shopify.com/s/files/1/0427/9477/8791/files/78187547102.pdf
    • https://cdn.shopify.com/s/files/1/0437/2316/1768/files/ds3_champion_gundyr.pdf
    • https://cdn.shopify.com/s/files/1/0435/4244/6231/files/34334138409.pdf
    • https://cdn.shopify.com/s/files/1/0433/4639/5304/files/avl_tree_in_java.pdf
    • https://cdn.shopify.com/s/files/1/0437/1369/1799/files/furufemaninipub.pdf
    • https://cdn.shopify.com/s/files/1/0440/4091/3046/files/xupexonufaforivoguxuz.pdf
    • https://cdn.shopify.com/s/files/1/0428/4396/3559/files/motorcycle_oil_filter_cross_reference.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
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNU
    • http://www.gnu.org/copyleft/gpl.htmRegular

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00010409.bin
f8b4f15f1e7f1ea1c8c926b6803117fee4ac81c1d21788f31526f1227d47505e		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x10409 65044 bytes
font_00_sfnt_off0000e5aa.bin
20d06a9e1b03af24b15c5e88f1cf6de48093325fb632e1dc85150974ed889cb0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE5AA 5528 bytes
font_01_sfnt_off0000f865.bin
9f9735dfffc8c011bc9e8ef237ff2436957f0c37a3f9eed5660ee2153b6c9474		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF865 3772 bytes
font_03_sfnt_off00016569.bin
8ac82a56edac667a4a71130aeeac043979da156e3f09f80e53af9c6b640bf4de		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16569 14948 bytes
font_04_sfnt_off00019432.bin
881633287527f3e4a7c0df68c839b1dc31a2930b5d0c8d0e1346e7634ca5850e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x19432 6460 bytes

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