Malicious PDF — malware analysis report

Static analysis result for SHA-256 3568ecd9539232d0…

MALICIOUS

PDF

59.6 KB Created: 2020-08-24 13:12:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d8490867a62c01d01d7421e2defe4068 SHA-1: 086c9fb31aea5c7d5f1d2ed7747de0cf374b4df5 SHA-256: 3568ecd9539232d007b95e0a1081efc03caf544119d0193bfbf493dc3804e090
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Phishing: Spearphishing Attachment T1059.001 Command and Scripting Interpreter: PowerShell T1204.002 Malicious Link

The PDF contains a heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/pify?keyword=cuddle+buddy+application+form+blank'. The document body also contains this URL, suggesting a lure to trick users into clicking it. The PDF also exhibits characteristics of a link farm, with numerous embedded links, many pointing to Shopify domains. The ML classifier strongly flagged this PDF as malicious.

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.cc/pify?keyword=cuddle+buddy+application+form+blank
    • http://files.sherrysroom.org/uploads/1/3/1/4/131453870/0b7dbd.pdf
    • https://cdn.shopify.com/s/files/1/0446/6386/5497/files/d_h_a_ki_full_form.pdf
    • https://cdn.shopify.com/s/files/1/0439/9353/0526/files/dark_cloud_2_monica_weapon_chart.pdf
    • https://cdn.shopify.com/s/files/1/0434/5865/8456/files/pegubagusudeza.pdf
    • https://cdn.shopify.com/s/files/1/0432/7643/5621/files/snake_in_python.pdf
    • https://cdn.shopify.com/s/files/1/0431/8471/7979/files/kuranisuziwamotije.pdf
    • https://cdn.shopify.com/s/files/1/0435/0866/2440/files/install_ipa_on_iphone.pdf
    • https://cdn.shopify.com/s/files/1/0431/3363/2661/files/7455487448.pdf
    • https://cdn.shopify.com/s/files/1/0437/8047/2984/files/dupumi.pdf
    • https://cdn.shopify.com/s/files/1/0465/4684/5854/files/depusizarimukaj.pdf
    • https://cdn.shopify.com/s/files/1/0452/5621/2642/files/ifa_exhibitor_list.pdf
    • https://cdn.shopify.com/s/files/1/0431/6617/1287/files/82460898051.pdf
    • https://cdn.shopify.com/s/files/1/0432/8233/3851/files/38044030466.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 7

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006074.bin
50c60118a87415fe0636e701c289483a9230d0b1b30e01c4f6b10e1ad3b7a26d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6074 3260 bytes
font_01_sfnt_off00006c21.bin
de2def360f54020bc833c058743310f781e4d896d5cf914c88c816f2d171cada		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C21 5336 bytes
font_02_sfnt_off00007e2b.bin
4fe25ba7928097a7f10c49d48fbdfa3d67d5c298e0e27f2e336b771430a3570e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E2B 2152 bytes
font_03_sfnt_off00008739.bin
0460e4b819836684ee646564f23d3767bfcf5407a742f126e14b557faf704447		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8739 5852 bytes
font_04_sfnt_off000095f0.bin
d4e873b46bd519cf10dda29eca8d6e3f7eef0144e478f666fbee554e4a8a985a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x95F0 10376 bytes
font_05_sfnt_off0000b9c3.bin
9bff7ddbefd4d2bde9afc975cd75135cb90b8554def9bf2cbae7ababcc655485		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB9C3 16352 bytes
font_06_sfnt_off0000cfc3.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCFC3 4324 bytes

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