Malicious PDF — malware analysis report

Static analysis result for SHA-256 167211b8bf773b54…

MALICIOUS

PDF

50.1 KB Created: 2020-10-18 16:17:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 48cd9f1467da0728e2a0f0c71c702859 SHA-1: 946e42d2362196adc50846def8c3209fac5b9ba5 SHA-256: 167211b8bf773b5409f6bc2d16cfd54399b0f1e2e8dbbc9f85485ae132ea7801
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, with one identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body appears to be corrupted or obfuscated, but the presence of URLs and the PDF_MALICIOUS_REDIRECTOR_LINK heuristic suggest an attempt to redirect users to malicious content, possibly for phishing or malware distribution.

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.link/123?keyword=sharedpreferences+android+studio+save
    • https://nulixedupalaz.weebly.com/uploads/1/3/0/7/130739510/8ca522c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/351e7032-4d22-4394-a55f-d41ebc432976/kazuf.pdf
    • https://uploads.strikinglycdn.com/files/683cd993-9494-499b-99e5-01854f4e3485/91233078773.pdf
    • https://uploads.strikinglycdn.com/files/2364631f-d7e2-45ca-8139-ac96e17c8790/80332724117.pdf
    • https://uploads.strikinglycdn.com/files/0ce05775-14ac-4e12-b1d9-e6374feadf09/kidivu.pdf
    • https://cdn.shopify.com/s/files/1/0503/0487/6727/files/wewiwe.pdf
    • https://cdn.shopify.com/s/files/1/0492/4106/3590/files/xuzomad.pdf
    • https://cdn.shopify.com/s/files/1/0432/4435/5739/files/29919011242.pdf
    • https://cdn.shopify.com/s/files/1/0484/9260/9686/files/springfield_illinois_weather_forecast_hourly.pdf
    • https://uploads.strikinglycdn.com/files/9db8dc84-027c-4491-afa5-3172df1fe2fd/88497439553.pdf
    • https://uploads.strikinglycdn.com/files/f9d1a28a-83a1-42dc-8f23-4d72c67e2695/13164905232.pdf
    • https://uploads.strikinglycdn.com/files/dbca2cbb-09b8-422f-b401-d4759139025e/59241834571.pdf
    • https://uploads.strikinglycdn.com/files/f9ef4a27-a288-41a9-bb96-c6080cb5fbec/marobidepopobibupuredobu.pdf
    • https://uploads.strikinglycdn.com/files/ab11e5ca-5619-4c6a-813b-86248478ab8e/47553942007.pdf
    • https://uploads.strikinglycdn.com/files/580d4fe7-210d-4a3a-aaf2-932b99f5f857/tupezirirosok.pdf
    • https://cdn.shopify.com/s/files/1/0488/0623/2229/files/posing_guide_childrens_portrait_photography.pdf
    • https://cdn.shopify.com/s/files/1/0502/2393/9753/files/rejetoju.pdf
    • https://cdn.shopify.com/s/files/1/0428/4874/7687/files/how_to_uninstall_avg_on_mac.pdf
    • https://cdn.shopify.com/s/files/1/0491/6989/1494/files/20399055138.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007b92.bin
ab3f4c59808a2c598cb92740996b076b600d90ba4f4de47d7beb386a06da6e98		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B92 5372 bytes
font_01_sfnt_off00008dd8.bin
7c7caa34c89028cb08a9fc2f0dbad00faf42eff5536733eba69f2069f9e489fa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8DD8 14156 bytes

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