Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f4494966f55fb7f…

MALICIOUS

PDF

49.4 KB Created: 2020-07-29 13:00:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 80b4950d95dea32246402f451e3b9cde SHA-1: 0ff2a7fb394708962301bebbe95030b567bb65c2 SHA-256: 7f4494966f55fb7f1fd34bd828aef86f8541c1133c523f487a432d95e543a4b6
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, suggesting a link farm or SEO manipulation tactic. One prominent URL, 'https://ttraff.com/pify?keyword=scaled+agile+framework+book+pdf', is flagged as a malicious redirector, indicating an attempt to lead users to harmful content. The ML classifier also strongly flagged this PDF as malicious.

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.com/pify?keyword=scaled+agile+framework+book+pdf
    • http://files.purearmstrong.ca/uploads/1/3/0/8/130813095/1020814.pdf
    • http://files.sevenskyexpert.com/uploads/1/3/0/7/130739674/zutez-mebijama.pdf
    • http://files.christineshanks.com/uploads/1/3/1/4/131437982/6064072.pdf
    • http://files.moongoat.com/uploads/1/3/1/3/131379828/xizujufodivu-teratesakujasij-xuxakomow.pdf
    • http://files.317-447-4377.com/uploads/1/3/2/6/132682739/lezotemipivifujuguki.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/4311/0555/files/mewizofizolimipew.pdf
    • https://cdn.shopify.com/s/files/1/0430/3031/5159/files/25723790183.pdf
    • https://cdn.shopify.com/s/files/1/0430/4620/7650/files/zamalelomejurilumukovema.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/bijalikupuxamimidesedol.pdf
    • https://cdn.shopify.com/s/files/1/0429/0255/2735/files/13661018111.pdf
    • https://cdn.shopify.com/s/files/1/0431/6423/7988/files/86170791993.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/pagujusevidunevaf.pdf
    • https://cdn.shopify.com/s/files/1/0435/3772/7637/files/6252323118.pdf
    • https://cdn.shopify.com/s/files/1/0437/8276/6743/files/64265594180.pdf
    • https://cdn.shopify.com/s/files/1/0433/5327/6574/files/zutejopevonalufasora.pdf
    • https://cdn.shopify.com/s/files/1/0430/7088/1946/files/91847949936.pdf
    • https://cdn.shopify.com/s/files/1/0431/5476/8021/files/56278712590.pdf
    • https://cdn.shopify.com/s/files/1/0431/0158/5570/files/fazurix.pdf
    • https://cdn.shopify.com/s/files/1/0433/0350/1989/files/sotabuwopade.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_off000082a1.bin
4eca88c8a2349b3f902eb1d3310360ea1ddd551ba8bf207f929c25a52f326064		 pdf-font-stream PDF embedded font (sfnt) at offset 0x82A1 5300 bytes
font_01_sfnt_off000094a1.bin
af97854426c0d635ccbc0c962ffcf498a9122c4d6947cf06b2855a43c01acb13		 pdf-font-stream PDF embedded font (sfnt) at offset 0x94A1 10300 bytes

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