Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a3517e196d38d72…

MALICIOUS

PDF

55.0 KB Created: 2020-07-30 17:20:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3992796d624c1ccd601984a42060c274 SHA-1: 80b8367e18434be803015b5f36e7d2c26543a301 SHA-256: 5a3517e196d38d7281b7e67d2df62c46f4505c8675f8a5f74abe3e26d3d12b18
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically `https://ttraff.ru/pify?keyword=larson+algebra+2+textbook+answers+pdf`. Additionally, it exhibits characteristics of a PDF link farm, with numerous links pointing to external PDFs, suggesting an attempt to manipulate search engine results or distribute malicious 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.ru/pify?keyword=larson+algebra+2+textbook+answers+pdf
    • http://files.humanivillages.org/uploads/1/3/0/9/130969428/rejewabilirijadana.pdf
    • http://files.stonecutterswsq.com/uploads/1/3/0/9/130969818/3446600.pdf
    • http://files.mr-stevens.com/uploads/1/3/0/7/130776864/zoxakaso.pdf
    • http://files.newteachersretreat.com/uploads/1/3/1/3/131398517/3759174.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/0820/4708/files/dudekakanepevilaw.pdf
    • https://cdn.shopify.com/s/files/1/0437/7270/6977/files/jikoku.pdf
    • https://cdn.shopify.com/s/files/1/0432/5575/9011/files/mefomagixupilunu.pdf
    • https://cdn.shopify.com/s/files/1/0437/8093/1742/files/66602580083.pdf
    • https://cdn.shopify.com/s/files/1/0431/1410/2951/files/58050032928.pdf
    • https://cdn.shopify.com/s/files/1/0430/4620/7650/files/93940691065.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/51507598499.pdf
    • https://cdn.shopify.com/s/files/1/0428/2508/9191/files/pijogekizupakajowinuxizi.pdf
    • https://cdn.shopify.com/s/files/1/0431/6741/6488/files/jaxodafafo.pdf
    • https://cdn.shopify.com/s/files/1/0432/2826/6654/files/korirebazuwedowatema.pdf
    • https://cdn.shopify.com/s/files/1/0431/4464/2715/files/gavowipozukeguwakekamum.pdf
    • https://cdn.shopify.com/s/files/1/0430/9575/2864/files/dorataligin.pdf
    • https://cdn.shopify.com/s/files/1/0431/1692/0996/files/paluligebirasafuvakirito.pdf
    • https://cdn.shopify.com/s/files/1/0432/8436/5468/files/mowerit.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_off000095ab.bin
39222564b3e37a7c5756feb816071fb7ce966b2122d263f3a88025be66025eb5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x95AB 5388 bytes
font_01_sfnt_off0000a821.bin
2a9c26a9ef56a2bad2d1cc7139bb04037a3c99c495d4b3a94c517ae00ef4632e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA821 10656 bytes

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