Malicious PDF — malware analysis report

Static analysis result for SHA-256 7adf4637f835acc1…

MALICIOUS

PDF

44.7 KB Created: 2020-08-12 04:53:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 31f2aee8602036bf900a534732e6920b SHA-1: 8a1d51a1fbf4acc89895bf05213a4b3002768f0f SHA-256: 7adf4637f835acc145ad67a15e188035ffc5782977af330891fd1641608aa38c
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 URL, indicating a link farm or SEO poisoning attempt. The primary malicious URL identified is https://ttraff.ru/pify?keyword=ncert+biology+pdf+in+english, which is likely used to direct users to malicious content. The document body, though heavily obfuscated, also contains this URL, reinforcing its role in the attack.

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/pify?keyword=ncert+biology+pdf+in+english
    • http://files.willmarhypnosis.com/uploads/1/3/0/7/130775398/b42cec8bd5d5e0.pdf
    • http://files.sophiaunfolds.org/uploads/1/3/0/7/130775675/47b33d035c657.pdf
    • http://rosafe.rialtotrophy.com/uploads/1/3/1/4/131407164/771a1efd6ab48a6.pdf
    • http://bagoje.acousticecology.com.au/uploads/1/3/0/9/130969352/puxudetebu.pdf
    • http://files.joyspringsbyjudy.com/uploads/1/3/1/8/131872298/b398af129502c48.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/9614/6074/files/57634991230.pdf
    • https://cdn.shopify.com/s/files/1/0437/1555/9573/files/61425189521.pdf
    • https://cdn.shopify.com/s/files/1/0437/9095/8749/files/95867429944.pdf
    • https://cdn.shopify.com/s/files/1/0437/9358/0189/files/dajamekaguviwavulevexe.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/sefumiwizekoreletete.pdf
    • https://cdn.shopify.com/s/files/1/0429/1664/2975/files/john_j_macionis_sociology_14th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0436/8983/6697/files/jawobi.pdf
    • https://cdn.shopify.com/s/files/1/0437/4442/8181/files/bodilaferodi.pdf
    • https://cdn.shopify.com/s/files/1/0431/0974/4789/files/srimad_bhagavatam_10th_canto.pdf
    • https://cdn.shopify.com/s/files/1/0429/0933/5715/files/89446906918.pdf
    • https://cdn.shopify.com/s/files/1/0435/5594/6647/files/rulagufij.pdf
    • https://cdn.shopify.com/s/files/1/0433/8404/5719/files/payback_period_method_example.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_off00006683.bin
9819713e359a2ede1eaabd8a4db9c229afc55d151ba966c02592ca5ddc7d3f11		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6683 5416 bytes
font_01_sfnt_off000078ee.bin
0e66b60153f0e16db0b29550cc2ad600c6e22a3624f85602526ad64218f41ebf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78EE 13780 bytes

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