Malicious PDF — malware analysis report

Static analysis result for SHA-256 357b4a0d5c4d320e…

MALICIOUS

PDF

38.8 KB Created: 2020-07-10 03:10:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 166503a729e6679176340e3db45a8d21 SHA-1: aaa33f0bde9f91abb035794692a5fe51d4d47d83 SHA-256: 357b4a0d5c4d320e95ee04dc786aec01950d5a6d62acf17b51a2b81ad8dadac7
152 Risk Score

Malware Insights

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

The PDF document contains a lure related to an 'Nvidia quadro p6000 manual' but is primarily a link farm designed to redirect users to various external websites. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK indicates that at least one of these links points to known malicious infrastructure. The PDF_SEO_LINK_FARM heuristic confirms the presence of a large number of external links, suggesting a spam or SEO poisoning campaign.

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/wb?keyword=nvidia%20quadro%20p6000%20manual
    • http://files.herbrainchild.com/uploads/1/3/2/6/132681293/79f7662812.pdf
    • http://files.crestlinepto.com/uploads/1/3/0/8/130814535/756a758c.pdf
    • http://files.greenwareproduct.com/uploads/1/3/2/6/132695467/pawemo_nobemetevodizur.pdf
    • http://files.legg-acy.ca/uploads/1/3/0/8/130873771/48431ba5a1cec4d.pdf
    • http://files.adelaideflowerwallexperts.com.au/uploads/1/3/1/1/131164351/ab66992a2.pdf
    • http://files.nantucketbuildersassociation.org/uploads/1/3/0/7/130776100/vowapis-dozujokekaxuv-vuzuxut.pdf
    • http://files.gcproviders.com/uploads/1/3/0/9/130969709/fidakix_webeva.pdf
    • http://files.radarstrongjones.com/uploads/1/3/2/7/132710780/kuxamaj.pdf
    • https://pusetojax.files.wordpress.com/2020/07/57380261978.pdf
    • https://patepekugi.files.wordpress.com/2020/06/97215873015.pdf
    • https://kebusura.files.wordpress.com/2020/06/babokikuwesefiripigonev.pdf
    • https://femolobibigu.files.wordpress.com/2020/06/6628524849.pdf
    • https://xujonajodezo.files.wordpress.com/2020/06/66019409148.pdf
    • https://seluvexij.files.wordpress.com/2020/07/93937315502.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/73121007565.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/dadimutixiwukigojubiw.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/40429789840.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/pifafesilepobusofamut.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/sikotifukiv.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/38030937597.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/savowogofoxifonikili.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000058b5.bin
4faa1bd61867d3b805fb32eb8f66933751dbe00a6847068d02a147a129289365		 pdf-font-stream PDF embedded font (sfnt) at offset 0x58B5 5060 bytes
font_01_sfnt_off000069c1.bin
5720154615d4a77a8420d667cecc734c2ce18d71aef3f66179aa74a5d2293861		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69C1 10556 bytes

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