Malicious PDF — malware analysis report

Static analysis result for SHA-256 62f25b795705ebd9…

MALICIOUS

PDF

43.3 KB Created: 2020-08-11 13:07:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 62a49aacfa23eb1a2c58e599c57ce53f SHA-1: 859bb50e9082d82307b7285c874868870e74fba9 SHA-256: 62f25b795705ebd9a95af7170022612084c3df01d4cc1e07d9315cdf49cbfe23
154 Risk Score

Malware Insights

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

The PDF contains a link that redirects to malicious infrastructure, masquerading as a download for an 'Anaconda python manual pdf'. This is supported by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The PDF also contains a large number of external PDF links, indicating a link farm, as flagged by PDF_SEO_LINK_FARM. While no scripts were extracted, the presence of embedded URLs and the ML classifier's high confidence suggest a malicious intent to redirect users to potentially harmful 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.cc/wb?keyword=anaconda%20python%20manual%20pdf
    • http://wekaz.thelittletreatmentroom.ca/uploads/1/3/0/8/130874655/tiwize-pukij.pdf
    • http://files.opalandplum.com/uploads/1/3/0/7/130775276/xewozexili.pdf
    • http://kulorux.wvmonarch.org/uploads/1/3/1/3/131380213/wifajum.pdf
    • http://nutufadaf.timelessvoicesohio.com/uploads/1/3/1/4/131408024/pipojazunizer.pdf
    • http://girabef.societyofoldsalts.com/uploads/1/3/1/3/131380429/8728600.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/9030/5443/files/bimonebesixivixiluji.pdf
    • https://cdn.shopify.com/s/files/1/0431/4349/5841/files/75862906465.pdf
    • https://cdn.shopify.com/s/files/1/0431/8127/7352/files/7237511389.pdf
    • https://cdn.shopify.com/s/files/1/0438/3178/7670/files/asset_management_company_profile.pdf
    • https://cdn.shopify.com/s/files/1/0429/8237/5577/files/wakorodinada.pdf
    • https://cdn.shopify.com/s/files/1/0435/3110/8504/files/riviter.pdf
    • https://cdn.shopify.com/s/files/1/0431/6993/9612/files/zapuluvitifo.pdf
    • https://cdn.shopify.com/s/files/1/0432/9878/3382/files/zusogawetufexefem.pdf
    • https://cdn.shopify.com/s/files/1/0440/0028/0734/files/55775714927.pdf
    • https://cdn.shopify.com/s/files/1/0434/6478/6086/files/43077807569.pdf
    • https://cdn.shopify.com/s/files/1/0439/2783/0696/files/rekela.pdf
    • https://cdn.shopify.com/s/files/1/0439/1878/6728/files/67289153848.pdf
    • https://cdn.shopify.com/s/files/1/0431/0351/8887/files/943246319.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_off00006bf9.bin
60215fd6ea8dbed768bccdf4dda78d32cf562f4b623b52334cf4121bc4da5f8f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6BF9 5212 bytes
font_01_sfnt_off00007d97.bin
591b7daefc8a30dd81399b8c67fb2c452c45ebe3e0fe4e6de218c3f92e7e62d0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D97 10144 bytes

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