Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c4cdfe7c942ae29…

MALICIOUS

PDF

72.5 KB Created: 2020-08-30 19:09:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f84e2ab1577ac7aab1230b62bd0c7156 SHA-1: 8bc7f9e46d48e1dc807c2d58d47bda816dd625a5 SHA-256: 4c4cdfe7c942ae298d6289237fd5a651ad3d62c61876898b324eff4a99f273b7
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a mass external link farm, with a primary URL pointing to a known malicious redirector. The document body, though heavily obfuscated, contains the text 'M exto extpmtodo pomodoro de estudo download' and the malicious URL, suggesting a lure for users seeking study materials. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous links to external PDFs indicates a likely attempt to distribute further malicious content or engage in SEO abuse.

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.com/wix?keyword=m%25C3%25A9todo+pomodoro+de+estudo+download
    • https://static.usrfiles.com/ugd/b8c837_a41e5d5ece614bd98c5f9e7f2b01bf2b.pdf
    • https://static.usrfiles.com/ugd/0aab01_a84426539e794c2cab50875cf4fa2346.pdf
    • https://static.usrfiles.com/ugd/b8c837_1a36d9949354433ca8684a5763695c9d.pdf
    • https://static.usrfiles.com/ugd/e5a943_f85cd21aa94c4610ac0061cf87d2da74.pdf
    • https://cdn.shopify.com/s/files/1/0431/4362/6912/files/bstc_paper_2019_answer_key_reasoning.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/nefodegaxinavikiva.pdf
    • https://cdn.shopify.com/s/files/1/0437/4816/3735/files/76870895192.pdf
    • https://cdn.shopify.com/s/files/1/0433/9181/1734/files/62422180129.pdf
    • https://cdn.shopify.com/s/files/1/0431/5866/7415/files/dibujarte_tomos.pdf
    • https://cdn.shopify.com/s/files/1/0434/4669/8146/files/brain_on_fire_my_month_of_madness.pdf
    • https://cdn.shopify.com/s/files/1/0433/8958/3514/files/gunilekanu.pdf
    • https://cdn.shopify.com/s/files/1/0431/7026/7291/files/43249070371.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b651.bin
278606c8f99fed601932463b774337d055473224c7ba09742e090868eb40c4d3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB651 5344 bytes
font_01_sfnt_off0000c833.bin
1a1c9dd2d0b975a3e605e609e6ae882f474ed1cd58403abaf95602143de3d138		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC833 2148 bytes
font_02_sfnt_off0000d1f7.bin
a3b94cdaa2bbbbe32bc0701c26566027000c8a8b9e5167dc611da8a5e73410b7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD1F7 13292 bytes
font_03_sfnt_off0000fa1d.bin
c55273a883f24d8a3816e4e24a6729e2fd9ae39a47fcdb8e3e452b321d30f01e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA1D 17088 bytes

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