Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f874ad5c312f2c0…

MALICIOUS

PDF

51.2 KB Created: 2020-09-01 16:04:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c4b369e3534c430a60dcca944a0b27b0 SHA-1: 62450b0a960f1fedfc548bc6fd6881af1b9a4cf9 SHA-256: 9f874ad5c312f2c034a6dbe334ed8192ab3b3f549641387fa31e5f022489b11f
152 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded links, characteristic of a link farm. One of the primary links, 'https://ttraff.com/wix?keyword=algebra+questions+and+answers+year+9', is flagged as a malicious redirector. The document body, though heavily obfuscated, appears to contain the same URL and other links to PDF files hosted on 'static.usrfiles.com', suggesting an attempt to lure users to external, potentially harmful, content under the guise of educational material. The ML classifier also strongly indicated maliciousness.

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=algebra+questions+and+answers+year+9
    • https://static.usrfiles.com/ugd/b8c837_5428e0bdcff242df9558c1964139c32d.pdf
    • https://static.usrfiles.com/ugd/362633_8fdc0296542b478da209af4230383861.pdf
    • https://static.usrfiles.com/ugd/5e8de6_68f675bb841b4606a849f1897705a6cb.pdf
    • https://static.usrfiles.com/ugd/8acad3_422b115b23e94dcf9823c3ba4b04d7a5.pdf
    • https://static.usrfiles.com/ugd/784815_f0950ec8ff794af3ae07cd58bef76865.pdf
    • https://static.usrfiles.com/ugd/8d57bd_6762985a73234153a753b0f92ad813e4.pdf
    • https://static.usrfiles.com/ugd/79e0dc_1bb53ae11b2d4cafa4b5f52cd57e9a5a.pdf
    • https://static.usrfiles.com/ugd/e1c37d_1334c459d7a14d60affd9deccbb98106.pdf
    • https://static.usrfiles.com/ugd/4cf28d_682723a379aa413a835537498e547beb.pdf
    • https://static.usrfiles.com/ugd/253000_d012502133264a30a67b770fd2d607c4.pdf
    • https://cdn.shopify.com/s/files/1/0440/6670/1477/files/xirokumurobanugoleb.pdf
    • https://cdn.shopify.com/s/files/1/0437/1510/0840/files/lineare_gleichungen_aufgaben_lsungen.pdf
    • https://cdn.shopify.com/s/files/1/0437/9633/2705/files/open_innovation_definition.pdf
    • https://cdn.shopify.com/s/files/1/0433/8024/4643/files/free_download_adobe_acrobat_edit_file.pdf
    • https://cdn.shopify.com/s/files/1/0431/2567/0037/files/monusewamotudopup.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_off00007f39.bin
60d103f4e3caab6345363263ff07b6705d115f5b12d66dedb85a592bf3f7799c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F39 5596 bytes
font_01_sfnt_off0000925b.bin
d18b968c78feee22e45bbf7c49995467f6c66bd1fc23a222ca50ee051aa80c95		 pdf-font-stream PDF embedded font (sfnt) at offset 0x925B 14004 bytes

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