Malicious PDF — malware analysis report

Static analysis result for SHA-256 371e7f0f1df4f908…

MALICIOUS

PDF

55.4 KB Created: 2020-09-16 18:09:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2640192a26b9f5efd1f4d382c9de518c SHA-1: 37399e51a650557ad2c27a2ddc6b49101ebe39d5 SHA-256: 371e7f0f1df4f9085a1f331fa965ac61a6165b0f397c232897b54efac8808bbf
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.me/wix?keyword=minecraft+pe+14.0+apk+indir'. This URL is the primary indicator of malicious intent. The document body, though heavily obfuscated, also contains this URL, reinforcing its role as a lure. The presence of a large number of embedded links, many pointing to benign-looking PDF files, suggests a link farm strategy to obscure 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.me/wix?keyword=minecraft+pe+14.0+apk+indir
    • https://34493a9c-0cbe-4768-91ce-7d373c521055.filesusr.com/ugd/682d1c_b8409b5c4be64a6bba0f7b25dbafdeff.pdf?index=true
    • https://cb35c8e9-be74-4194-934c-ea9d001dab08.filesusr.com/ugd/429b25_58363d4433d546e0a17c7021c6caa9fe.pdf?index=true
    • https://5249d201-745a-4acc-ba39-186aa93a809b.filesusr.com/ugd/02631b_309aad936f4e4e87b4b531c24e790490.pdf?index=true
    • https://cdn.shopify.com/s/files/1/0434/6304/9376/files/80312721493.pdf
    • https://cdn.shopify.com/s/files/1/0433/5622/5694/files/vinimukesomavesuzilozaz.pdf
    • https://cdn.shopify.com/s/files/1/0427/6636/8935/files/26688136265.pdf
    • https://cdn.shopify.com/s/files/1/0434/6164/0342/files/51807860737.pdf
    • https://cdn.shopify.com/s/files/1/0431/5879/8492/files/bemobiseruder.pdf
    • https://cdn.shopify.com/s/files/1/0433/5704/4904/files/13016153193.pdf
    • https://cdn.shopify.com/s/files/1/0436/0214/9540/files/april_2020_act_b04.pdf
    • https://cdn.shopify.com/s/files/1/0433/0592/6809/files/fimal.pdf
    • https://00255a61-8ca1-4e49-ab94-53f3e60b02f4.filesusr.com/ugd/067ecb_ee51d9d0e8b8405b943fc8dfcf803331.pdf?index=true
    • https://dcfb7aa9-afa0-49c9-a64f-344e70e3322c.filesusr.com/ugd/8da65f_6b8ce1d943594b2e8832492e2c8a222f.pdf?index=true
    • 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_off000099ae.bin
9b13c0ffd546643492e0701063e587805e9a3d36df2e0c4efb713946459c6d4b
pdf-font-stream PDF embedded font (sfnt) at offset 0x99AE 5320 bytes
font_01_sfnt_off0000abf7.bin
ae73f4571353230ed14819c100d7bb588546239cec6f3274db13b26a6990affe
pdf-font-stream PDF embedded font (sfnt) at offset 0xABF7 10876 bytes