Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b741de141c940f7…

MALICIOUS

PDF

48.3 KB Created: 2020-08-05 11:45:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f39c960de222ca2f4fbd86cbf29f7525 SHA-1: c37fdce4e7fab7e44d2f7a2bba08bf2fc13d443d SHA-256: 3b741de141c940f7b86a82a0fd0e3bbcfe5b0607ce14254005dffb952ad1e9da
152 Risk Score

Malware Insights

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

The PDF contains a link that redirects to malicious infrastructure, disguised as a search result for a specific document. The PDF also hosts a large number of external links, many pointing to benign Shopify URLs, suggesting a link farm or SEO poisoning tactic. The ML classifier strongly indicated maliciousness, and the PDF structure itself contains a malicious redirector link.

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=algorithms+jeff+erickson+solutions+pdf
    • http://guxodoju.mightygreen.com/uploads/1/3/1/8/131857631/gefesukanowa.pdf
    • http://xubapi.staceyweckstein.biz/uploads/1/3/1/4/131437363/9b194.pdf
    • http://files.unlimitedpotentialaz.org/uploads/1/3/2/7/132712661/20f27d2ef87c.pdf
    • http://files.bereangracechurch.com/uploads/1/3/0/9/130969699/dbfb4aa.pdf
    • http://files.yasminerose.com/uploads/1/3/2/8/132814906/sitip.pdf
    • https://cdn.shopify.com/s/files/1/0434/5534/8888/files/foxaxesinukata.pdf
    • https://cdn.shopify.com/s/files/1/0430/1075/2663/files/58875904882.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/40369191557.pdf
    • https://cdn.shopify.com/s/files/1/0432/0801/6027/files/tekinoxilitawixiz.pdf
    • https://cdn.shopify.com/s/files/1/0439/6072/9758/files/what_does_doki_mean.pdf
    • https://cdn.shopify.com/s/files/1/0428/0716/5095/files/rojinalewokitoxeserawodak.pdf
    • https://cdn.shopify.com/s/files/1/0434/3591/7464/files/28261547165.pdf
    • https://cdn.shopify.com/s/files/1/0432/3459/0878/files/87411830334.pdf
    • https://cdn.shopify.com/s/files/1/0429/9299/2410/files/da_form_7223_bullet_examples.pdf
    • https://cdn.shopify.com/s/files/1/0437/8768/1952/files/lipton_biology_of_belief.pdf
    • https://cdn.shopify.com/s/files/1/0433/5131/0488/files/nuromutukibopidan.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/36283751979.pdf
    • https://cdn.shopify.com/s/files/1/0431/8262/0834/files/60311076719.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000065ed.bin
6306e55733b1df747f2a6371deb599215f17759ae291aae04a72f163132837fa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65ED 5368 bytes
font_01_sfnt_off0000780b.bin
49dddaa543544930169c80d10742cf71a10a90771d945bdf421e53748b1fa594		 pdf-font-stream PDF embedded font (sfnt) at offset 0x780B 2140 bytes
font_02_sfnt_off000081e5.bin
49af0c991b72d43fef6061ec6610f0eab418f7bdaa9ee3aa5c3360730c52ee44		 pdf-font-stream PDF embedded font (sfnt) at offset 0x81E5 10352 bytes
font_03_sfnt_off0000a55f.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA55F 4324 bytes

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