Malicious PDF — malware analysis report

Static analysis result for SHA-256 138d7989bae3562b…

MALICIOUS

PDF

41.3 KB Created: 2020-08-14 07:21:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 35d3ce9546a1e0cb995bfe8317174948 SHA-1: 1103f01843a2d8ad7165f1c3acc0991263b1aa69 SHA-256: 138d7989bae3562bae94554ff6de57e99828e80ff92f47b1808cdee1305fcc9c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, many of which point to external PDF files, forming a link farm. One prominent link redirects to a malicious URL, suggesting an attempt to lead the user to harmful content. The ML classifier also strongly indicated maliciousness.

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/pify?keyword=whistle+baby+tone+ringtone
    • http://files.thbeautytherapy.com/uploads/1/3/1/6/131637137/7981264df0a15.pdf
    • http://lufoti.harbottleaudio.com/uploads/1/3/2/7/132712207/84a684c779f.pdf
    • http://files.mountpleasantequestrian.com/uploads/1/3/1/3/131398144/mifisifinuduwil-kafel-mubidukuweroxi.pdf
    • http://files.kellermarkethouse.org/uploads/1/3/2/7/132741144/887391.pdf
    • http://files.learning2step.com/uploads/1/3/2/7/132741023/731a98df995.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0432/6585/1542/files/53880413544.pdf
    • https://cdn.shopify.com/s/files/1/0434/1625/6662/files/pewebevezaka.pdf
    • https://cdn.shopify.com/s/files/1/0447/2838/5690/files/40429259435.pdf
    • https://cdn.shopify.com/s/files/1/0429/7526/4924/files/buvujugapedapaxa.pdf
    • https://cdn.shopify.com/s/files/1/0431/0630/4153/files/smoke_detector_notifier_882.pdf
    • https://cdn.shopify.com/s/files/1/0437/9561/1805/files/sabarimala_temple_history_in_tamil.pdf
    • https://cdn.shopify.com/s/files/1/0431/3815/4650/files/35133010433.pdf
    • https://cdn.shopify.com/s/files/1/0437/7768/7706/files/amputee_mobility_predictor_test.pdf
    • https://cdn.shopify.com/s/files/1/0431/9684/2142/files/40720604027.pdf
    • https://cdn.shopify.com/s/files/1/0431/2875/0241/files/xebowinazimufitakovusa.pdf
    • https://cdn.shopify.com/s/files/1/0431/8055/6452/files/makil.pdf
    • https://cdn.shopify.com/s/files/1/0447/9621/5456/files/blogging_for_dummies_download.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005158.bin
aeae4e565158eb234f0ae2cd6d8b4b1ad476febc69edce581162ea35954ab0a8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5158 4992 bytes
font_01_sfnt_off00006243.bin
afe160deef8b88de73048a49fb992a6cf9e35e6e7811f8967c2c54dbaa232920		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6243 12688 bytes
font_02_sfnt_off000089eb.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x89EB 4324 bytes

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