Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc1487478303cc89…

MALICIOUS

PDF

48.5 KB Created: 2020-08-29 19:39:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f1b49a251a2d2e53597207aaa1c9d22c SHA-1: 7e043c8266555d93f4d04edebbecf410c2a4b3f2 SHA-256: bc1487478303cc89f8717a31d38894959ba006a6f7d250928fb42d357efa8bef
152 Risk Score

Malware Insights

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

The PDF document contains multiple embedded links, with one pointing to a known malicious redirector at `https://ttraff.com/wix?keyword=my+homework+lesson+6`. The document body, though heavily obfuscated, contains text related to homework and a URL, suggesting a lure to trick users into visiting malicious sites. The ML classifier strongly indicated maliciousness, and the presence of a link farm further supports a malicious intent to redirect users.

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=my+homework+lesson+6
    • https://cdn.shopify.com/s/files/1/0434/0681/9477/files/cs_lewis_anthology.pdf
    • https://cdn.shopify.com/s/files/1/0433/8122/7672/files/dojunasugof.pdf
    • https://cdn.shopify.com/s/files/1/0437/4256/0407/files/44998560416.pdf
    • https://cdn.shopify.com/s/files/1/0450/1107/5222/files/list_of_all_html_tags_and_attributes_with_definition.pdf
    • https://cdn.shopify.com/s/files/1/0435/0532/0088/files/tetegazimona.pdf
    • https://static.usrfiles.com/ugd/b8c837_9ef5f099d7c24892b17015a034fc3c0e.pdf
    • https://static.usrfiles.com/ugd/b8c837_b5454b90080f4979982861724bee7770.pdf
    • https://static.usrfiles.com/ugd/b8c837_9af0223be4134b44aeaca6abddd61bdf.pdf
    • https://static.usrfiles.com/ugd/b8c837_9ac67685347c418a8d01357a5a585f4a.pdf
    • https://static.usrfiles.com/ugd/af0aa9_9c28551cdc9b4248996365361912ed5b.pdf
    • https://cdn.shopify.com/s/files/1/0432/4861/5579/files/antecedents_of_job_satisfaction.pdf
    • https://cdn.shopify.com/s/files/1/0431/0899/1140/files/fonusefadiza.pdf
    • https://cdn.shopify.com/s/files/1/0466/3227/2037/files/como_cruzar_un_gallo_asil.pdf
    • https://cdn.shopify.com/s/files/1/0428/1804/4070/files/53855794904.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_off00006b71.bin
a22d373a4ce4b0fb45b1d62c65b4d37eef53c4a2360a1ba219cb3ad31153955c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B71 5132 bytes
font_01_sfnt_off00007cdd.bin
70a97effbccdb62e21fc929424d7853dbf7c92d519e78f2895d47fe776b83760		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7CDD 10324 bytes
font_02_sfnt_off0000a06a.bin
337061c2d29aa3d9bd5e23318413974294dd07a884ac7fb734df56b2d7fdf86a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA06A 16060 bytes

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