Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a4d1221623b1068…

MALICIOUS

PDF

39.4 KB Created: 2020-08-24 15:53:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 303215665fe280ced91c2ad0881105c9 SHA-1: 05bd1d6f3b78b1b0912b10b8ba841ceaf2d26cc3 SHA-256: 2a4d1221623b10684758b40b2964bc4c3a23b6d59526a9cb88fe00446996a9df
152 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, with one identified as a malicious redirector. The ML classifier strongly indicated maliciousness. The document body, though heavily obfuscated, contains a URL that appears to be part of a link farm designed to distribute malicious content. The presence of numerous external links suggests an attempt to lure users to external, potentially harmful, resources.

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/pify?keyword=europe+after+ww2+map+activity+answers
    • http://files.koinonia.ca/uploads/1/3/0/9/130969440/wugezonexukajemijazi.pdf
    • http://musasu.joshrthomas.com/uploads/1/3/2/7/132740214/3630300.pdf
    • https://cdn.shopify.com/s/files/1/0437/6562/9077/files/android_10_gestures_pixel_3.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/39086675177.pdf
    • https://cdn.shopify.com/s/files/1/0432/4484/7266/files/intentional_teaching_strategies.pdf
    • https://cdn.shopify.com/s/files/1/0466/3869/4565/files/payment_of_gratuity_act_2019.pdf
    • https://cdn.shopify.com/s/files/1/0428/8610/3207/files/iobit_driver_booster_5._5.pdf
    • https://cdn.shopify.com/s/files/1/0428/0342/9535/files/70200283786.pdf
    • https://cdn.shopify.com/s/files/1/0431/0332/2261/files/gemupatoxopumob.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_off00005c7b.bin
60b032e9c849749049545232aa6f97d37a1d73a5e6ec0dd398c5dd46175541a7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C7B 5472 bytes
font_01_sfnt_off00006f28.bin
288f324a66fa9cf00f02299ce5cd6e085931776406a297bbe7066c50267604ba		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F28 10012 bytes

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