Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d930b9d77bf9802…

MALICIOUS

PDF

41.9 KB Created: 2020-07-10 03:35:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e5eaff06060e7286c09419469924151b SHA-1: a2a030ba088276e2b8013adbb923ef276120d28a SHA-256: 1d930b9d77bf980252a8f9859bd4000e1d2e33e85337ad44ba23f2a962f35cba
154 Risk Score

Malware Insights

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

The PDF document is designed as a lure, masquerading as a worksheet answer key to entice users to click on numerous embedded links. The primary malicious link identified is https://ttraff.ru/wb?keyword=water%20erosion%20and%20deposition%20worksheet%20answer%20key, which is flagged as a redirector to malicious infrastructure. The document also contains a large number of other PDF links, many of which point to domains associated with link farms, suggesting a broad distribution or SEO poisoning tactic.

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=water%20erosion%20and%20deposition%20worksheet%20answer%20key
    • http://files.travelsbyjill.com/uploads/1/3/0/9/130969628/napopuzajas.pdf
    • http://files.simplypairedcatering.com/uploads/1/3/2/6/132695399/d57ca9.pdf
    • http://files.frontporcharts.org/uploads/1/3/0/7/130739069/5237679.pdf
    • http://files.treadawayclass.org/uploads/1/3/1/8/131856331/e9d225e9.pdf
    • http://files.parkhillbowlingclub.com/uploads/1/3/2/8/132815154/4047543.pdf
    • http://files.vegoutwithmeagan.com/uploads/1/3/1/4/131437799/jipesopewabivaf-wivefidalejoz-logiganogi.pdf
    • http://files.duganspecialties.com/uploads/1/3/1/3/131398250/pulorijamaxav-kepar-zuboburewod.pdf
    • http://files.uluvmystyle.com/uploads/1/3/2/7/132740700/tagorota.pdf
    • https://jozimuril.files.wordpress.com/2020/06/fikuzudefubanipabelilutu.pdf
    • https://lusigezoxot.files.wordpress.com/2020/06/satunubesozumi.pdf
    • https://rizukajo.files.wordpress.com/2020/06/betagota.pdf
    • https://depivufegel.files.wordpress.com/2020/06/pipolinekutewo.pdf
    • https://bagesamajar.files.wordpress.com/2020/06/bexosuxeduzuvozatafajaf.pdf
    • https://turimofusi.files.wordpress.com/2020/06/49441502797.pdf
    • https://wufabok.files.wordpress.com/2020/07/tipexinovebigesunaxu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/78491346320.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/lojuxefututa.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/sejil.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/28821374719.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/vekedexixerokasadoboma.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/17844710077.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/85155057715.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_off00006730.bin
3c7aaf4db53a2fef14bf50290d7dc3e1e8204d623178f51c9fec7da1c251553c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6730 5072 bytes
font_01_sfnt_off0000787c.bin
5a49f001e41cec98f93467b534db6ce04fac3a6f59ba20a8711b49547d0cf78d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x787C 9792 bytes

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