Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdbecf8e2bacac26…

MALICIOUS

PDF

47.1 KB Created: 2020-08-15 05:09:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fc5b1d3694851f98ef386bfe94c2933c SHA-1: 38e069e2c71076109958837a5105c4df03f15115 SHA-256: cdbecf8e2bacac2680456a8ff1645579fa54b7590d5b626507e4f85376419129
152 Risk Score

Malware Insights

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

The PDF contains a link that redirects to a known malicious domain, ttraff.com, disguised as information about a TV show. The document also includes a large number of links to other PDFs, many hosted on Shopify, which is characteristic of a link farm. The ML classifier strongly indicates maliciousness.

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=wanted+tv+show+netflix+parents+guide
    • http://teguwipow.kaliaofelenite.com/uploads/1/3/0/7/130738667/6d129d34f1.pdf
    • http://files.onthewayotw.com/uploads/1/3/2/7/132740951/guxube_fogifasib_vosukeno_lowat.pdf
    • https://cdn.shopify.com/s/files/1/0435/5942/0063/files/biogas_digester_construction.pdf
    • https://cdn.shopify.com/s/files/1/0435/4716/4840/files/adblock_plus_full_apk.pdf
    • https://cdn.shopify.com/s/files/1/0432/5244/9444/files/21248278920.pdf
    • https://cdn.shopify.com/s/files/1/0448/9504/3751/files/3d_printing_technology_applications_and_selection.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/12729031526.pdf
    • https://cdn.shopify.com/s/files/1/0433/3728/5797/files/27347263909.pdf
    • https://cdn.shopify.com/s/files/1/0430/6881/7562/files/15186050220.pdf
    • https://cdn.shopify.com/s/files/1/0436/5864/1561/files/how_big_is_dauntless_pc.pdf
    • https://cdn.shopify.com/s/files/1/0432/2931/5229/files/15983330527.pdf
    • https://cdn.shopify.com/s/files/1/0434/0298/5622/files/54198130378.pdf
    • https://cdn.shopify.com/s/files/1/0429/1877/2903/files/blumenfeld_neuroanatomy_download.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_off000078bc.bin
c2fa1fcf1405100cd7ec8da53cf52f7d462d4c2eb72fee63dee3bf0ce62c79ae
pdf-font-stream PDF embedded font (sfnt) at offset 0x78BC 5536 bytes
font_01_sfnt_off00008baf.bin
91a70760e844de89315627cf7b58a101efdc5231153992c1ee90634653fb29c8
pdf-font-stream PDF embedded font (sfnt) at offset 0x8BAF 10420 bytes