Malicious PDF — malware analysis report

Static analysis result for SHA-256 37c289b870fbf8eb…

MALICIOUS

PDF

43.8 KB Created: 2020-08-31 10:11:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c4de35310ca70b916adc80d94cdd5554 SHA-1: 42fa723a529a2595c7b351ea6e367b21f83b7254 SHA-256: 37c289b870fbf8eb40e8af8bf39496a3098df48390ad8c0848071561dec62d07
152 Risk Score

Malware Insights

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

The PDF was flagged as malicious by a machine learning classifier and contains a critical heuristic indicating a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the same URL found in the redirector link. The presence of numerous other links, many pointing to Shopify domains hosting PDF files, suggests a link farm or SEO poisoning tactic to disguise the malicious redirector.

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=el+pianista+del+gueto+de+varsovia+ep
    • https://cdn.shopify.com/s/files/1/0429/9902/1717/files/akeeba_backup_joomla_3_free.pdf
    • https://cdn.shopify.com/s/files/1/0438/1537/0912/files/zombie_belle_movie.pdf
    • https://cdn.shopify.com/s/files/1/0432/3311/6317/files/53488003291.pdf
    • https://cdn.shopify.com/s/files/1/0431/1249/7312/files/octane_blender_manual.pdf
    • https://cdn.shopify.com/s/files/1/0437/3174/6967/files/kuvogivaxuzuxunojup.pdf
    • https://cdn.shopify.com/s/files/1/0437/4839/3112/files/59820215828.pdf
    • https://cdn.shopify.com/s/files/1/0437/6051/7271/files/basic_vocabulary_in_use_north_american.pdf
    • https://cdn.shopify.com/s/files/1/0427/9592/5671/files/luvizamupul.pdf
    • https://static.usrfiles.com/ugd/b8c837_1b16dcbb143740b0b66df7c31f0e49de.pdf
    • https://static.usrfiles.com/ugd/bdeb4c_792ec9d7e9a24bec8b5979653c5e3dc6.pdf
    • https://static.usrfiles.com/ugd/99afdc_adefb391f80a41a1a380c153d44691cc.pdf
    • https://static.usrfiles.com/ugd/b8c837_b1eb81697ff347718ec98a3c8ebf3ed8.pdf
    • https://static.usrfiles.com/ugd/89363e_de3dc09bf6274f4195bf232476aab542.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000068e3.bin
0e3c8ccabd65ccfb3238a2910c08acf348147311285d08850c7b9cf97eb7b74e
pdf-font-stream PDF embedded font (sfnt) at offset 0x68E3 5144 bytes
font_01_sfnt_off00007a7a.bin
0f8df6a54c4b008f028a47deaa37711ccef62e24a92e3152a3c72d9f9947a29d
pdf-font-stream PDF embedded font (sfnt) at offset 0x7A7A 11772 bytes