Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff890cdab15386ac…

MALICIOUS

PDF

53.6 KB Created: 2020-08-29 22:52:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0e014f7053e03cd7518a0cc80af0d066 SHA-1: 1eeffd369d7e4da079e263cc268aa424a391bd06 SHA-256: ff890cdab15386ac492a1dcd694358895bea060c7ed6cb16a3e7356027facca0
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 heuristic, suggesting it is the primary malicious component. The presence of a link farm further supports the malicious intent of distributing traffic to potentially harmful sites.

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=virus+arn+monocatenario+positivo+y+negativo
    • https://static.usrfiles.com/ugd/b8c837_5eee86ec470147e69c592b2fc9c5d367.pdf
    • https://static.usrfiles.com/ugd/b8c837_470c600901784a6480168fd239ba6a75.pdf
    • https://static.usrfiles.com/ugd/d54300_08e87ef67023447ab54d8a44d8ce4747.pdf
    • https://static.usrfiles.com/ugd/9ff9b8_ce2af2fecbee4cc19a8bd739023f17be.pdf
    • https://static.usrfiles.com/ugd/10e3af_392fd81e9c804750ace63412a42ff6de.pdf
    • https://cdn.shopify.com/s/files/1/0428/6716/3302/files/zazuxukokowaromizulavosi.pdf
    • https://cdn.shopify.com/s/files/1/0433/4501/9045/files/91666099142.pdf
    • https://cdn.shopify.com/s/files/1/0432/1558/5448/files/the_beatles_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0431/5955/2155/files/capability_definition.pdf
    • https://static.usrfiles.com/ugd/b8c837_b2bdaabe6eac49cabe9427dcaf520c74.pdf
    • https://static.usrfiles.com/ugd/b8c837_bf320dace5ef4899b94c0e7b89ca9479.pdf
    • https://static.usrfiles.com/ugd/b8c837_c59f6c0eb37742cda4586de8e5ae4a8a.pdf
    • https://cdn.shopify.com/s/files/1/0465/0965/4174/files/zatiwefomalimurowep.pdf
    • https://cdn.shopify.com/s/files/1/0433/5442/3445/files/angles_and_parallel_lines_worksheet_gina_wilson.pdf
    • https://cdn.shopify.com/s/files/1/0432/2865/9874/files/94083703044.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_off0000909d.bin
1fbc25401fa8134614655144ef785a81652144f9dc83b72ae6579b04bed26a8d
pdf-font-stream PDF embedded font (sfnt) at offset 0x909D 5348 bytes
font_01_sfnt_off0000a2c5.bin
6d8c33450be4130477314ad3870dac85ce3e0608b2ae35bb9da709a58de19261
pdf-font-stream PDF embedded font (sfnt) at offset 0xA2C5 11232 bytes