Malicious PDF — malware analysis report

Static analysis result for SHA-256 8df50f194aedf5d1…

MALICIOUS

PDF

60.4 KB Created: 2020-08-07 04:25:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e22eae91ba3ce3d5ca875e45555a8f1e SHA-1: 1be78305165ad89594feaf12508956a9dbe72d29 SHA-256: 8df50f194aedf5d198ddff76381aa9cbedb9cbcfc877e3a0b312c161c52a222f
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing for a malicious redirector. The document body, though obfuscated, contains text related to a manual and a URL that appears to be part of a link farm designed to attract search engine traffic. The primary malicious URL identified is https://ttraff.ru/wb?keyword=assault%20air%20runner%20console%20manual, which is likely used for phishing or to redirect to further malicious content.

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.ru/wb?keyword=assault%20air%20runner%20console%20manual
    • http://files.kidsoutdoorliving.com.au/uploads/1/3/2/6/132696512/nivemebis-dirasuf-lonilipitinok-nopasefav.pdf
    • http://files.goodnews4thecounty.com/uploads/1/3/1/4/131437711/vilusotewamo-mizojisefug-tadinewepe.pdf
    • http://files.becrofty.com/uploads/1/3/1/4/131453636/xopubepudelafuzit.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/46496449222.pdf
    • https://cdn.shopify.com/s/files/1/0431/1810/0637/files/35579207069.pdf
    • https://cdn.shopify.com/s/files/1/0433/7546/0517/files/fakabatujipexag.pdf
    • https://cdn.shopify.com/s/files/1/0430/4686/3005/files/serugevizotafome.pdf
    • https://cdn.shopify.com/s/files/1/0436/9888/0680/files/tomas_rueda_azorin.pdf
    • https://cdn.shopify.com/s/files/1/0430/3880/2073/files/pirowavug.pdf
    • https://cdn.shopify.com/s/files/1/0428/5225/3863/files/77195822082.pdf
    • https://cdn.shopify.com/s/files/1/0433/7097/1299/files/kikipimuniveforexose.pdf
    • https://cdn.shopify.com/s/files/1/0429/5249/1159/files/38940513034.pdf
    • https://cdn.shopify.com/s/files/1/0431/0692/6754/files/38990045853.pdf
    • https://cdn.shopify.com/s/files/1/0431/9661/2768/files/kegesotabasabonoved.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_off0000a207.bin
b8bd62a85d59c354addb9b41f2fabef96b083a6a42ea54e421f4b18ad1d0dfe9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA207 4936 bytes
font_01_sfnt_off0000b2ad.bin
31b297bdd1ae1f2143a8d7f79cfa03a76b2a014fd8cacd89fb36f485eda913b4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB2AD 2364 bytes
font_02_sfnt_off0000bce1.bin
dd8643862691d085bf64ff37a7203b21dbd729629dc501dd7c0c34493dfffba8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBCE1 11840 bytes

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