Malicious PDF — malware analysis report

Static analysis result for SHA-256 a03eb24a65e0d258…

MALICIOUS

PDF

49.4 KB Created: 2020-08-21 16:25:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d3beaca22a61e703e5a8ee9077a296cb SHA-1: e8c3dffe50273707fe65a1bfeab1f0103c1f78e8 SHA-256: a03eb24a65e0d2583bf46dfba9e1b235af7a6429b017842f1059825a184645f6
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Phishing: Spearphishing Link T1204.002 Malicious Link

The PDF contains a high number of embedded URLs, many of which point to Shopify domains hosting other PDFs, a technique often used for SEO manipulation or to create a link farm. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://ttraff.com/pify?keyword=brenda+fassie+black+president'. The ML classifier also strongly indicated maliciousness. No scripts were extracted, and the document body is heavily obfuscated, but the primary attack pattern appears to be redirection and link farming.

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=brenda+fassie+black+president
    • http://kipevov.driver-guider.co.uk/uploads/1/3/1/4/131406013/badifeziri-fivalojizev.pdf
    • http://files.deborahmauldinlicsw.com/uploads/1/3/0/8/130874647/4821116.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/dadimutixiwukigojubiw.pdf
    • https://cdn.shopify.com/s/files/1/0440/6139/3046/files/bhagavad_gita_chapter_15.pdf
    • https://cdn.shopify.com/s/files/1/0430/3929/3589/files/gejikazudezematu.pdf
    • https://cdn.shopify.com/s/files/1/0435/7029/9038/files/88731189558.pdf
    • https://cdn.shopify.com/s/files/1/0433/4541/2261/files/suketajiwir.pdf
    • https://cdn.shopify.com/s/files/1/0430/8670/8890/files/65806100184.pdf
    • https://cdn.shopify.com/s/files/1/0429/8909/3018/files/xorekonifiradimeweno.pdf
    • https://cdn.shopify.com/s/files/1/0429/7038/2490/files/bisage.pdf
    • https://cdn.shopify.com/s/files/1/0435/6728/4379/files/nidorino_gen_3_learnset.pdf
    • https://cdn.shopify.com/s/files/1/0434/5190/8249/files/may_calendar_2018_printable.pdf
    • https://cdn.shopify.com/s/files/1/0429/0949/9551/files/mumipasalubimurule.pdf
    • https://cdn.shopify.com/s/files/1/0431/4107/1016/files/79823524838.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006d21.bin
6d0a8c281fe19e6c4c089f67097917a4a54ecdabdcd54dda88df6127bc7c3208		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D21 5080 bytes
font_01_sfnt_off00007e67.bin
7087aa954066792365ea45232ea8721a1c2377eaa18ff9c530c4995558d992db		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E67 14092 bytes
font_02_sfnt_off0000aac1.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAAC1 4324 bytes

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