Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9df055c7cae108c…

MALICIOUS

PDF

81.5 KB Created: 2020-08-11 07:20:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 272d2d89bae1f0c394573923b7f68144 SHA-1: 5ee4c9702b4e8d9ba7520f360da4f9fa3db5af0d SHA-256: f9df055c7cae108c8fa7c8987ae074acde6cf6e7a520fa037a265218b350be91
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/pify?keyword=aviation+alphabet+pdf'. Additionally, it exhibits a PDF link farm heuristic, with numerous external PDF links, many hosted on Shopify. The ML classifier also strongly flagged this PDF as malicious. The document body contains obfuscated text and the target URL, suggesting a lure to a malicious site.

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/pify?keyword=aviation+alphabet+pdf
    • http://jonoge.midwestmattress.net/uploads/1/3/0/8/130814328/04a24ca07d44f1.pdf
    • http://files.lorahakanson.com/uploads/1/3/0/9/130969926/lilujana.pdf
    • http://lasexili.1beautifulyou.com/uploads/1/3/2/7/132741555/400ecbd5d67cea.pdf
    • http://files.hinxworthandedworthvillagehall.org.uk/uploads/1/3/1/4/131406403/pivonove.pdf
    • http://files.abishealthbeauty.com/uploads/1/3/1/4/131437380/fumavowixuleve.pdf
    • https://cdn.shopify.com/s/files/1/0429/5720/9766/files/97523403573.pdf
    • https://cdn.shopify.com/s/files/1/0431/7442/8827/files/gojadanojomawokosupexip.pdf
    • https://cdn.shopify.com/s/files/1/0431/0378/1015/files/adobe_cs6_master_collection_serial_number_crack.pdf
    • https://cdn.shopify.com/s/files/1/0433/4164/3928/files/wepabuvazujebopufopexo.pdf
    • https://cdn.shopify.com/s/files/1/0438/2762/6134/files/52515058491.pdf
    • https://cdn.shopify.com/s/files/1/0435/4310/1591/files/venaxosefovuluvig.pdf
    • https://cdn.shopify.com/s/files/1/0431/7764/0092/files/virowefebun.pdf
    • https://cdn.shopify.com/s/files/1/0433/4921/3349/files/alain_de_botton_essays_in_love.pdf
    • https://cdn.shopify.com/s/files/1/0433/1008/8357/files/kiwuvipemejopel.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_off0000e05b.bin
a58b9e655cd6e5df15d369000d20d6df549f4177f734b15aa0b9f03df80aacdd
pdf-font-stream PDF embedded font (sfnt) at offset 0xE05B 4832 bytes
font_01_sfnt_off0000f0bc.bin
9f85fd5227bfb582ac7f6987fc1eddff2ba481aa1de0a712a8b881ca6b3ea105
pdf-font-stream PDF embedded font (sfnt) at offset 0xF0BC 20184 bytes
font_02_sfnt_off00012b1c.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e
pdf-font-stream PDF embedded font (sfnt) at offset 0x12B1C 4324 bytes