Malicious PDF — malware analysis report

Static analysis result for SHA-256 1364d53c4db709f8…

MALICIOUS

PDF

38.6 KB Created: 2020-08-26 11:18:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 48a594ce37ae0b694335f45fe2141ad2 SHA-1: 5538a8a3dff245bf4e3ba417520609b781d4d13e SHA-256: 1364d53c4db709f8d2baf7e8b2fbfc7babc1ad4f5f2362b532af4d03386a5cbd
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 a redirector service known for malicious activity. The ML classifier also strongly indicated maliciousness. While no scripts were directly extracted, the PDF structure and embedded links suggest an attempt to lure users to malicious sites, potentially for phishing or malware distribution.

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.link/pify?keyword=saxalxo+aftiaqi+impeqsi
    • http://files.nathangentryphoto.com/uploads/1/3/1/3/131381901/e7ab3894a073.pdf
    • http://files.indesignz.us/uploads/1/3/0/7/130739021/c65e20c.pdf
    • http://files.gobehopevietnam.com/uploads/1/3/0/8/130874403/f94a2ddfdc3.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/6451/6005/files/sikizawuxamelis.pdf
    • https://cdn.shopify.com/s/files/1/0439/2330/8712/files/30346938625.pdf
    • https://cdn.shopify.com/s/files/1/0431/2439/2087/files/zodijutefokatexowiwilotav.pdf
    • https://cdn.shopify.com/s/files/1/0428/4078/5062/files/mefefelenopojuvilenip.pdf
    • https://cdn.shopify.com/s/files/1/0429/1880/5657/files/polar_coordinates.pdf
    • https://cdn.shopify.com/s/files/1/0430/0472/3349/files/argument_essay_example.pdf
    • https://cdn.shopify.com/s/files/1/0431/9540/0356/files/23677900013.pdf
    • https://cdn.shopify.com/s/files/1/0431/5296/5792/files/52062668351.pdf
    • https://cdn.shopify.com/s/files/1/0432/1977/9742/files/98870167792.pdf
    • https://cdn.shopify.com/s/files/1/0429/5468/6617/files/47048822665.pdf
    • https://cdn.shopify.com/s/files/1/0430/8012/2532/files/27366471632.pdf
    • https://cdn.shopify.com/s/files/1/0438/5213/6608/files/apache_cassandra_jdbc_driver.pdf
    • https://cdn.shopify.com/s/files/1/0430/7812/3669/files/72745907624.pdf
    • https://cdn.shopify.com/s/files/1/0436/0758/9027/files/posujig.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_off00004ddb.bin
2bf39f484e9b250c85608e933438548fbe9ac2914253bacddb6a3b0811fa3d94		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4DDB 5248 bytes
font_01_sfnt_off00005fad.bin
9da5805538c8b3de6e004d00e2e1c172f1f7e2cc5738bc418d4741dd0003a58e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5FAD 2696 bytes
font_02_sfnt_off00006b74.bin
eee16c147042e44a0ddc57863357a660be478254bd8c7906b6431ea0df7ce4ae		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B74 9932 bytes

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